{
  "title": "Length - Grade 5 CBSE",
  "total_questions": 100,
  "questions": [
    {"id": 1, "difficulty": "easy", "question": "Convert 5 meters to centimeters.", "options": {"A": "50 cm", "B": "500 cm", "C": "5000 cm", "D": "50000 cm"}, "correct_answer": "B"},
    {"id": 2, "difficulty": "easy", "question": "How many millimeters are in 1 centimeter?", "options": {"A": "10 mm", "B": "100 mm", "C": "1000 mm", "D": "10000 mm"}, "correct_answer": "A"},
    {"id": 3, "difficulty": "easy", "question": "Convert 3.5 meters to centimeters.", "options": {"A": "35 cm", "B": "350 cm", "C": "3500 cm", "D": "35000 cm"}, "correct_answer": "B"},
    {"id": 4, "difficulty": "easy", "question": "How many centimeters are in 2 meters?", "options": {"A": "20 cm", "B": "200 cm", "C": "2000 cm", "D": "20000 cm"}, "correct_answer": "B"},
    {"id": 5, "difficulty": "easy", "question": "Convert 250 centimeters to meters.", "options": {"A": "0.25 m", "B": "2.5 m", "C": "25 m", "D": "250 m"}, "correct_answer": "B"},
    {"id": 6, "difficulty": "easy", "question": "How many meters are in 1 kilometer?", "options": {"A": "10 m", "B": "100 m", "C": "1000 m", "D": "10000 m"}, "correct_answer": "C"},
    {"id": 7, "difficulty": "easy", "question": "Convert 4.2 meters to centimeters.", "options": {"A": "42 cm", "B": "420 cm", "C": "4200 cm", "D": "42000 cm"}, "correct_answer": "B"},
    {"id": 8, "difficulty": "easy", "question": "How many millimeters are in 5 centimeters?", "options": {"A": "50 mm", "B": "500 mm", "C": "5000 mm", "D": "50000 mm"}, "correct_answer": "A"},
    {"id": 9, "difficulty": "easy", "question": "Convert 180 centimeters to meters.", "options": {"A": "0.18 m", "B": "1.8 m", "C": "18 m", "D": "180 m"}, "correct_answer": "B"},
    {"id": 10, "difficulty": "easy", "question": "How many centimeters are in 0.75 meters?", "options": {"A": "7.5 cm", "B": "75 cm", "C": "750 cm", "D": "7500 cm"}, "correct_answer": "B"},
    {"id": 11, "difficulty": "easy", "question": "Convert 2.8 meters to centimeters.", "options": {"A": "28 cm", "B": "280 cm", "C": "2800 cm", "D": "28000 cm"}, "correct_answer": "B"},
    {"id": 12, "difficulty": "easy", "question": "How many meters are in 500 centimeters?", "options": {"A": "0.5 m", "B": "5 m", "C": "50 m", "D": "500 m"}, "correct_answer": "B"},
    {"id": 13, "difficulty": "easy", "question": "Convert 6.25 meters to centimeters.", "options": {"A": "62.5 cm", "B": "625 cm", "C": "6250 cm", "D": "62500 cm"}, "correct_answer": "B"},
    {"id": 14, "difficulty": "easy", "question": "How many millimeters are in 8 centimeters?", "options": {"A": "80 mm", "B": "800 mm", "C": "8000 mm", "D": "80000 mm"}, "correct_answer": "A"},
    {"id": 15, "difficulty": "easy", "question": "Convert 320 centimeters to meters.", "options": {"A": "0.32 m", "B": "3.2 m", "C": "32 m", "D": "320 m"}, "correct_answer": "B"},
    {"id": 16, "difficulty": "easy", "question": "How many centimeters are in 1.2 meters?", "options": {"A": "12 cm", "B": "120 cm", "C": "1200 cm", "D": "12000 cm"}, "correct_answer": "B"},
    {"id": 17, "difficulty": "easy", "question": "Convert 0.9 meters to centimeters.", "options": {"A": "9 cm", "B": "90 cm", "C": "900 cm", "D": "9000 cm"}, "correct_answer": "B"},
    {"id": 18, "difficulty": "easy", "question": "How many meters are in 750 centimeters?", "options": {"A": "0.75 m", "B": "7.5 m", "C": "75 m", "D": "750 m"}, "correct_answer": "B"},
    {"id": 19, "difficulty": "easy", "question": "Convert 5.6 meters to centimeters.", "options": {"A": "56 cm", "B": "560 cm", "C": "5600 cm", "D": "56000 cm"}, "correct_answer": "B"},
    {"id": 20, "difficulty": "easy", "question": "How many millimeters are in 12 centimeters?", "options": {"A": "120 mm", "B": "1200 mm", "C": "12000 mm", "D": "120000 mm"}, "correct_answer": "A"},

    {"id": 21, "difficulty": "medium", "question": "A rope is 12.5 meters long. If 3.75 meters is cut off, what length remains?", "options": {"A": "8.25 m", "B": "8.5 m", "C": "8.75 m", "D": "9 m"}, "correct_answer": "C"},
    {"id": 22, "difficulty": "medium", "question": "Convert 8.45 meters to centimeters.", "options": {"A": "84.5 cm", "B": "845 cm", "C": "8450 cm", "D": "84500 cm"}, "correct_answer": "B"},
    {"id": 23, "difficulty": "medium", "question": "A cloth merchant has 25.75 meters of cloth. He sells 8.35 meters. How much cloth remains?", "options": {"A": "17.2 m", "B": "17.3 m", "C": "17.4 m", "D": "17.5 m"}, "correct_answer": "C"},
    {"id": 24, "difficulty": "medium", "question": "Convert 1250 centimeters to meters.", "options": {"A": "1.25 m",
"B": "12.5 m",
"C": "125 m",
"D": "1250 m"
}, "correct_answer": "B"},
    {"id": 25, "difficulty": "medium", "question": "A pole is 4.8 meters long. If 1.25 meters is buried underground, what length is above ground?", "options": {"A": "3.45 m", "B": "3.5 m", "C": "3.55 m", "D": "3.6 m"}, "correct_answer": "C"},
    {"id": 26, "difficulty": "medium", "question": "Convert 6.28 meters to centimeters.", "options": {"A": "62.8 cm", "B": "628 cm", "C": "6280 cm", "D": "62800 cm"}, "correct_answer": "B"},
    {"id": 27, "difficulty": "medium", "question": "Three pieces of wood measure 2.5 m, 3.25 m, and 1.75 m. What is their total length?", "options": {"A": "7.25 m", "B": "7.4 m", "C": "7.5 m", "D": "7.75 m"}, "correct_answer": "C"},
    {"id": 28, "difficulty": "medium", "question": "Convert 875 centimeters to meters.", "options": {"A": "0.875 m", "B": "8.75 m", "C": "87.5 m", "D": "875 m"}, "correct_answer": "B"},
    {"id": 29, "difficulty": "medium", "question": "A ribbon is 15.6 meters long. If it is cut into 12 equal pieces, what is the length of each piece?", "options": {"A": "1.2 m", "B": "1.3 m", "C": "1.4 m", "D": "1.5 m"}, "correct_answer": "B"},
    {"id": 30, "difficulty": "medium", "question": "Convert 9.75 meters to centimeters.", "options": {"A": "97.5 cm", "B": "975 cm", "C": "9750 cm", "D": "97500 cm"}, "correct_answer": "B"},
    {"id": 31, "difficulty": "medium", "question": "A field is 45.5 meters long and 32.25 meters wide. What is the difference between its length and width?", "options": {"A": "12.25 m", "B": "13.25 m", "C": "14.25 m", "D": "15.25 m"}, "correct_answer": "B"},
    {"id": 32, "difficulty": "medium", "question": "Convert 1125 centimeters to meters.", "options": {"A": "1.125 m", "B": "11.25 m", "C": "112.5 m", "D": "1125 m"}, "correct_answer": "B"},
    {"id": 33, "difficulty": "medium", "question": "A rope is 18.75 meters long. If 4.35 meters is cut off, what length remains?", "options": {"A": "14.2 m", "B": "14.3 m", "C": "14.4 m", "D": "14.5 m"}, "correct_answer": "C"},
    {"id": 34, "difficulty": "medium", "question": "Convert 7.82 meters to centimeters.", "options": {"A": "78.2 cm", "B": "782 cm", "C": "7820 cm", "D": "78200 cm"}, "correct_answer": "B"},
    {"id": 35, "difficulty": "medium", "question": "Three sticks measure 1.85 m, 2.45 m, and 3.15 m. What is their total length?", "options": {"A": "7.35 m", "B": "7.4 m", "C": "7.45 m", "D": "7.5 m"}, "correct_answer": "C"},
    {"id": 36, "difficulty": "medium", "question": "Convert 965 centimeters to meters.", "options": {"A": "0.965 m", "B": "9.65 m", "C": "96.5 m", "D": "965 m"}, "correct_answer": "B"},
    {"id": 37, "difficulty": "medium", "question": "A cloth is 22.8 meters long. If 5.75 meters is sold, how much cloth remains?", "options": {"A": "16.95 m", "B": "17 m", "C": "17.05 m", "D": "17.1 m"}, "correct_answer": "C"},
    {"id": 38, "difficulty": "medium", "question": "Convert 8.95 meters to centimeters.", "options": {"A": "89.5 cm", "B": "895 cm", "C": "8950 cm", "D": "89500 cm"}, "correct_answer": "B"},
    {"id": 39, "difficulty": "medium", "question": "A pole is 7.2 meters long. If 2.15 meters is underground, what length is above ground?", "options": {"A": "4.95 m", "B": "5 m", "C": "5.05 m", "D": "5.1 m"}, "correct_answer": "C"},
    {"id": 40, "difficulty": "medium", "question": "Convert 1325 centimeters to meters.", "options": {"A": "1.325 m", "B": "13.25 m", "C": "132.5 m", "D": "1325 m"}, "correct_answer": "B"},
    {"id": 41, "difficulty": "medium", "question": "A ribbon is 28.5 meters long. If it is cut into 15 equal pieces, what is the length of each piece?", "options": {"A": "1.8 m", "B": "1.85 m", "C": "1.9 m", "D": "1.95 m"}, "correct_answer": "C"},
    {"id": 42, "difficulty": "medium", "question": "Convert 6.48 meters to centimeters.", "options": {"A": "64.8 cm", "B": "648 cm", "C": "6480 cm", "D": "64800 cm"}, "correct_answer": "B"},
    {"id": 43, "difficulty": "medium", "question": "A field is 52.75 meters long and 38.5 meters wide. What is the difference between its length and width?", "options": {"A": "13.25 m", "B": "14.25 m", "C": "15.25 m", "D": "16.25 m"}, "correct_answer": "B"},
    {"id": 44, "difficulty": "medium", "question": "Convert 1475 centimeters to meters.", "options": {"A": "1.475 m", "B": "14.75 m", "C": "147.5 m", "D": "1475 m"}, "correct_answer": "B"},
    {"id": 45, "difficulty": "medium", "question": "A rope is 24.8 meters long. If 6.45 meters is cut off, what length remains?", "options": {"A": "18.25 m", "B": "18.3 m", "C": "18.35 m", "D": "18.4 m"}, "correct_answer": "C"},
    {"id": 46, "difficulty": "medium", "question": "Convert 9.62 meters to centimeters.", "options": {"A": "96.2 cm", "B": "962 cm", "C": "9620 cm", "D": "96200 cm"}, "correct_answer": "B"},
    {"id": 47, "difficulty": "medium", "question": "Three sticks measure 2.15 m, 3.28 m, and 4.37 m. What is their total length?", "options": {"A": "9.7 m", "B": "9.75 m", "C": "9.8 m", "D": "9.85 m"}, "correct_answer": "C"},
    {"id": 48, "difficulty": "medium", "question": "Convert 1585 centimeters to meters.", "options": {"A": "1.585 m", "B": "15.85 m", "C": "158.5 m", "D": "1585 m"}, "correct_answer": "B"},
    {"id": 49, "difficulty": "medium", "question": "A cloth is 35.6 meters long. If 8.95 meters is sold, how much cloth remains?", "options": {"A": "26.55 m", "B": "26.6 m", "C": "26.65 m", "D": "26.7 m"}, "correct_answer": "C"},
    {"id": 50, "difficulty": "medium", "question": "Convert 7.39 meters to centimeters.", "options": {"A": "73.9 cm", "B": "739 cm", "C": "7390 cm", "D": "73900 cm"}, "correct_answer": "B"},
    {"id": 51, "difficulty": "medium", "question": "A pole is 9.4 meters long. If 3.25 meters is underground, what length is above ground?", "options": {"A": "6.05 m", "B": "6.1 m", "C": "6.15 m", "D": "6.2 m"}, "correct_answer": "C"},
    {"id": 52, "difficulty": "medium", "question": "Convert 1725 centimeters to meters.", "options": {"A": "1.725 m", "B": "17.25 m", "C": "172.5 m", "D": "1725 m"}, "correct_answer": "B"},
    {"id": 53, "difficulty": "medium", "question": "A ribbon is 42.75 meters long. If it is cut into 25 equal pieces, what is the length of each piece?", "options": {"A": "1.69 m", "B": "1.7 m", "C": "1.71 m", "D": "1.72 m"}, "correct_answer": "C"},
    {"id": 54, "difficulty": "medium", "question": "Convert 8.76 meters to centimeters.", "options": {"A": "87.6 cm", "B": "876 cm", "C": "8760 cm", "D": "87600 cm"}, "correct_answer": "B"},
    {"id": 55, "difficulty": "medium", "question": "A field is 68.5 meters long and 45.75 meters wide. What is the difference between its length and width?", "options": {"A": "22.65 m", "B": "22.7 m", "C": "22.75 m", "D": "22.8 m"}, "correct_answer": "C"},
    {"id": 56, "difficulty": "medium", "question": "Convert 1875 centimeters to meters.", "options": {"A": "1.875 m", "B": "18.75 m", "C": "187.5 m", "D": "1875 m"}, "correct_answer": "B"},
    {"id": 57, "difficulty": "medium", "question": "A rope is 32.6 meters long. If 7.85 meters is cut off, what length remains?", "options": {"A": "24.65 m", "B": "24.7 m", "C": "24.75 m", "D": "24.8 m"}, "correct_answer": "C"},
    {"id": 58, "difficulty": "medium", "question": "Convert 9.83 meters to centimeters.", "options": {"A": "98.3 cm", "B": "983 cm", "C": "9830 cm", "D": "98300 cm"}, "correct_answer": "B"},
    {"id": 59, "difficulty": "medium", "question": "Three sticks measure 3.25 m, 4.38 m, and 5.47 m. What is their total length?", "options": {"A": "13 m", "B": "13.05 m", "C": "13.1 m", "D": "13.15 m"}, "correct_answer": "C"},
    {"id": 60, "difficulty": "medium", "question": "Convert 1965 centimeters to meters.", "options": {"A": "1.965 m", "B": "19.65 m", "C": "196.5 m", "D": "1965 m"}, "correct_answer": "B"},
    {"id": 61, "difficulty": "medium", "question": "A cloth is 48.9 meters long. If 12.35 meters is sold, how much cloth remains?", "options": {"A": "36.45 m", "B": "36.5 m", "C": "36.55 m", "D": "36.6 m"}, "correct_answer": "C"},
    {"id": 62, "difficulty": "medium", "question": "Convert 8.47 meters to centimeters.", "options": {"A": "84.7 cm", "B": "847 cm", "C": "8470 cm", "D": "84700 cm"}, "correct_answer": "B"},
    {"id": 63, "difficulty": "medium", "question": "A pole is 11.8 meters long. If 4.45 meters is underground, what length is above ground?", "options": {"A": "7.25 m", "B": "7.3 m", "C": "7.35 m", "D": "7.4 m"}, "correct_answer": "C"},
    {"id": 64, "difficulty": "medium", "question": "Convert 2125 centimeters to meters.", "options": {"A": "2.125 m", "B": "21.25 m", "C": "212.5 m", "D": "2125 m"}, "correct_answer": "B"},
    {"id": 65, "difficulty": "medium", "question": "A ribbon is 56.25 meters long. If it is cut into 30 equal pieces, what is the length of each piece?", "options": {"A": "1.865 m", "B": "1.87 m", "C": "1.875 m", "D": "1.88 m"}, "correct_answer": "C"},
    {"id": 66, "difficulty": "medium", "question": "Convert 7.58 meters to centimeters.", "options": {"A": "75.8 cm", "B": "758 cm", "C": "7580 cm", "D": "75800 cm"}, "correct_answer": "B"},
    {"id": 67, "difficulty": "medium", "question": "A field is 75.8 meters long and 52.45 meters wide. What is the difference between its length and width?", "options": {"A": "23.25 m", "B": "23.3 m", "C": "23.35 m", "D": "23.4 m"}, "correct_answer": "C"},
    {"id": 68, "difficulty": "medium", "question": "Convert 2285 centimeters to meters.", "options": {"A": "2.285 m", "B": "22.85 m", "C": "228.5 m", "D": "2285 m"}, "correct_answer": "B"},
    {"id": 69, "difficulty": "medium", "question": "A rope is 41.7 meters long. If 9.65 meters is cut off, what length remains?", "options": {"A": "31.95 m", "B": "32 m", "C": "32.05 m", "D": "32.1 m"}, "correct_answer": "C"},
    {"id": 70, "difficulty": "medium", "question": "Convert 9.94 meters to centimeters.", "options": {"A": "99.4 cm", "B": "994 cm", "C": "9940 cm", "D": "99400 cm"}, "correct_answer": "B"},
    {"id": 71, "difficulty": "medium", "question": "Three sticks measure 4.15 m, 5.28 m, and 6.37 m. What is their total length?", "options": {"A": "15.7 m", "B": "15.75 m", "C": "15.8 m", "D": "15.85 m"}, "correct_answer": "C"},
    {"id": 72, "difficulty": "medium", "question": "Convert 2455 centimeters to meters.", "options": {"A": "2.455 m", "B": "24.55 m", "C": "245.5 m", "D": "2455 m"}, "correct_answer": "B"},
    {"id": 73, "difficulty": "medium", "question": "A cloth is 62.4 meters long. If 15.85 meters is sold, how much cloth remains?", "options": {"A": "46.45 m", "B": "46.5 m", "C": "46.55 m", "D": "46.6 m"}, "correct_answer": "C"},
    {"id": 74, "difficulty": "medium", "question": "Convert 8.69 meters to centimeters.", "options": {"A": "86.9 cm", "B": "869 cm", "C": "8690 cm", "D": "86900 cm"}, "correct_answer": "B"},
    {"id": 75, "difficulty": "medium", "question": "A pole is 14.6 meters long. If 5.75 meters is underground, what length is above ground?", "options": {"A": "8.75 m", "B": "8.8 m", "C": "8.85 m", "D": "8.9 m"}, "correct_answer": "C"},
    {"id": 76, "difficulty": "medium", "question": "Convert 2625 centimeters to meters.", "options": {"A": "2.625 m", "B": "26.25 m", "C": "262.5 m", "D": "2625 m"}, "correct_answer": "B"},
    {"id": 77, "difficulty": "medium", "question": "A ribbon is 67.5 meters long. If it is cut into 36 equal pieces, what is the length of each piece?", "options": {"A": "1.865 m", "B": "1.87 m", "C": "1.875 m", "D": "1.88 m"}, "correct_answer": "C"},
    {"id": 78, "difficulty": "medium", "question": "Convert 7.72 meters to centimeters.", "options": {"A": "77.2 cm", "B": "772 cm", "C": "7720 cm", "D": "77200 cm"}, "correct_answer": "B"},
    {"id": 79, "difficulty": "medium", "question": "A field is 82.75 meters long and 58.5 meters wide. What is the difference between its length and width?", "options": {"A": "24.15 m", "B": "24.2 m", "C": "24.25 m", "D": "24.3 m"}, "correct_answer": "C"},
    {"id": 80, "difficulty": "medium", "question": "Convert 2795 centimeters to meters.", "options": {"A": "2.795 m", "B": "27.95 m", "C": "279.5 m", "D": "2795 m"}, "correct_answer": "B"},

    {"id": 81, "difficulty": "hard", "question": "A train 150 m long crosses a pole in 10 seconds. What is its speed in km/h?", "options": {"A": "52 km/h", "B": "53 km/h", "C": "54 km/h", "D": "55 km/h"}, "correct_answer": "C"},
    {"id": 82, "difficulty": "hard", "question": "Two trains 120 m and 80 m long are running in opposite directions at 45 km/h and 30 km/h respectively. In what time will they cross each other?", "options": {"A": "8 seconds", "B": "9 seconds", "C": "10 seconds", "D": "11 seconds"}, "correct_answer": "C"},
   {"id":83,"difficulty":"hard","question":"A train crosses two bridges of lengths 200 m and 300 m in 25 seconds and 35 seconds respectively. What is the length of the train?","options":{"A":"40 m","B":"50 m","C":"60 m","D":"70 m"},"correct_answer":"B"}
, {"id": 84, "difficulty": "hard", "question": "A train 180 m long crosses a platform 220 m long in 20 seconds. What is its speed in km/h?", "options": {"A": "70 km/h", "B": "71 km/h", "C": "72 km/h", "D": "73 km/h"}, "correct_answer": "C"},
    {"id": 85, "difficulty": "hard", "question": "Two trains of lengths 150 m and 200 m are running towards each other at 54 km/h and 36 km/h respectively. In what time will they cross each other?", "options": {"A": "12 seconds", "B": "13 seconds", "C": "14 seconds", "D": "15 seconds"}, "correct_answer": "C"},
    {"id": 86, "difficulty": "hard", "question": "A train running at 72 km/h takes 15 seconds to pass a platform. If the train is 180 meters long, what is the length of the platform?", "options": {"A": "110 m", "B": "115 m", "C": "120 m", "D": "125 m"}, "correct_answer": "C"},
   {"id":87,"difficulty":"hard","question":"A train 200 m long crosses a pole in 10 seconds and another train of the same length moving in the opposite direction crosses it in 8 seconds. What is the speed of the second train?","options":{"A":"72 km/h","B":"80 km/h","C":"90 km/h","D":"100 km/h"},"correct_answer":"B"}
, {"id": 88, "difficulty": "hard", "question": "Two trains 140 m and 160 m long are running towards each other at 50 km/h and 40 km/h respectively. In what time will they be clear of each other?", "options": {"A": "10 seconds", "B": "11 seconds", "C": "12 seconds", "D": "13 seconds"}, "correct_answer": "C"},
    {"id": 89, "difficulty": "hard", "question": "A train crosses a platform 150 m long in 18 seconds and a man standing on the platform in 10 seconds. What is the length of the train?", "options": {"A": "175 m", "B": "180 m", "C": "185 m", "D": "190 m"}, "correct_answer": "B"},
    {"id": 90, "difficulty": "hard", "question": "A train 240 m long crosses a pole in 12 seconds. How long will it take to cross a platform 360 m long?", "options": {"A": "28 seconds", "B": "29 seconds", "C": "30 seconds", "D": "31 seconds"}, "correct_answer": "C"},
    {"id": 91, "difficulty": "hard", "question": "Two trains of equal length are running on parallel tracks in the same direction at 54 km/h and 36 km/h. The faster train passes the slower train in 40 seconds. What is the length of each train?", "options": {"A": "95 m", "B": "98 m", "C": "100 m", "D": "102 m"}, "correct_answer": "C"},
   {"id":92,"difficulty":"hard","question":"A train running at 63 km/h takes 20 seconds to pass a platform. It takes 12 seconds to pass a man walking at 3 km/h in the same direction. What is the length of the platform?","options":{"A":"180 m","B":"195 m","C":"200 m","D":"210 m"},"correct_answer":"B"}
, {"id": 93, "difficulty": "hard", "question": "A train 280 m long crosses a pole in 14 seconds. How long will it take to cross a tunnel 420 m long?", "options": {"A": "33 seconds", "B": "34 seconds", "C": "35 seconds", "D": "36 seconds"}, "correct_answer": "C"},
   {"id":94,"difficulty":"hard","question":"Two trains 160 m and 140 m long are running towards each other at 45 km/h and 54 km/h respectively. In what time will they cross each other?","options":{"A":"9 s","B":"10 s","C":"11 s","D":"12 s"},"correct_answer":"C"}
,{"id":95,"difficulty":"hard","question":"A train running at 81 km/h takes 18 seconds to pass a platform and 10 seconds to pass a man walking in the opposite direction at 6 km/h. What is the length of the platform?","options":{"A":"235 m","B":"240 m","C":"245 m","D":"250 m"},"correct_answer":"C"}
,  {"id": 96, "difficulty": "hard", "question": "A train 300 m long crosses a pole in 15 seconds. How long will it take to cross a bridge 450 m long?", "options": {"A": "35 seconds", "B": "36 seconds", "C": "37.5 seconds", "D": "38 seconds"}, "correct_answer": "C"},
    {"id": 97, "difficulty": "hard", "question": "Two trains of lengths 180 m and 220 m are running towards each other at 60 km/h and 48 km/h respectively. In what time will they be clear of each other?", "options": {"A": "13 seconds", "B": "14 seconds", "C": "15 seconds", "D": "16 seconds"}, "correct_answer": "C"},
 {
  "id": 98,
  "difficulty": "hard",
  "question": "A train crosses a platform 180 m long in 20 seconds and a man standing on the platform in 12 seconds. What is the speed of the train in km/h?",
  "options": {
    "A": "72 km/h",
    "B": "75 km/h", 
    "C": "78 km/h",
    "D": "81 km/h"
  },
  "correct_answer": "D"
},  {"id": 99, "difficulty": "hard", "question": "A train 250 m long crosses a pole in 12.5 seconds. How long will it take to cross a platform 350 m long?", "options": {"A": "28 seconds", "B": "29 seconds", "C": "30 seconds", "D": "31 seconds"}, "correct_answer": "C"},
{"id": 100, "difficulty": "hard", "question": "Two trains of equal length are running on parallel tracks in opposite directions at 54 km/h and 72 km/h. The trains cross each other in 12 seconds. What is the length of each train?", "options": {"A": "200 m", "B": "205 m", "C": "210 m", "D": "215 m"}, "correct_answer": "C"}
  ]
}