{
  "title": "Time, Distance and Speed (Direct and Inverse Variation) - Grade 8 ICSE",
  "total_questions": 60,
  "questions": [
    {
      "id": 1,
      "difficulty": "easy",
      "question": "🚗 Speed = Distance / ___.",
      "options": {
        "A": "Time",
        "B": "Acceleration",
        "C": "Velocity",
        "D": "Direction"
      },
      "correct_answer": "A"
    },
    {
      "id": 2,
      "difficulty": "easy",
      "question": "📏 If distance = 100 km, time = 2 hours, speed = ___ km/hr.",
      "options": { "A": 40, "B": 45, "C": 50, "D": 55 },
      "correct_answer": "C"
    },
    {
      "id": 3,
      "difficulty": "easy",
      "question": "⏱️ Time = Distance / ___.",
      "options": {
        "A": "Speed",
        "B": "Direction",
        "C": "Acceleration",
        "D": "Force"
      },
      "correct_answer": "A"
    },
    {
      "id": 4,
      "difficulty": "easy",
      "question": "🏎️ A car at 60 km/hr for 3 hours covers ___ km.",
      "options": { "A": 150, "B": 170, "C": 180, "D": 200 },
      "correct_answer": "C"
    },
    {
      "id": 5,
      "difficulty": "easy",
      "question": "🚶 Walking at 5 km/hr for 4 hours, distance?",
      "options": { "A": "18 km", "B": "20 km", "C": "22 km", "D": "24 km" },
      "correct_answer": "B"
    },
    {
      "id": 6,
      "difficulty": "easy",
      "question": "🚌 Distance = 240 km, speed = 40 km/hr. Time = ___ hours.",
      "options": { "A": 5, "B": 6, "C": 7, "D": 8 },
      "correct_answer": "B"
    },
    {
      "id": 7,
      "difficulty": "easy",
      "question": "✈️ Convert 72 km/hr to m/s.",
      "options": {
        "A": "15 m/s",
        "B": "18 m/s",
        "C": "20 m/s",
        "D": "25 m/s"
      },
      "correct_answer": "C"
    },
    {
      "id": 8,
      "difficulty": "easy",
      "question": "🚴 Cyclist covers 15 km in 1 hour. Speed in km/hr?",
      "options": { "A": 12, "B": 14, "C": 15, "D": 16 },
      "correct_answer": "C"
    },
    {
      "id": 9,
      "difficulty": "easy",
      "question": "🚗 A train travels 300 km in 5 hours. Average speed?",
      "options": {
        "A": "50 km/hr",
        "B": "55 km/hr",
        "C": "60 km/hr",
        "D": "65 km/hr"
      },
      "correct_answer": "C"
    },
    {
      "id": 10,
      "difficulty": "easy",
      "question": "⏳ To convert km/hr to m/s, multiply by ___.",
      "options": { "A": "5/18", "B": "18/5", "C": "10/36", "D": "36/10" },
      "correct_answer": "A"
    },
    {
      "id": 11,
      "difficulty": "easy",
      "question": "🏃 A runner at 8 m/s for 50 seconds. Distance?",
      "options": { "A": "300 m", "B": "350 m", "C": "400 m", "D": "450 m" },
      "correct_answer": "C"
    },
    {
      "id": 12,
      "difficulty": "easy",
      "question": "🚗 Speed 45 km/hr, time 2.5 hours. Distance?",
      "options": {
        "A": "100 km",
        "B": "110 km",
        "C": "112.5 km",
        "D": "120 km"
      },
      "correct_answer": "C"
    },
    {
      "id": 13,
      "difficulty": "easy",
      "question": "🚌 Distance 180 km, speed 60 km/hr. Time?",
      "options": {
        "A": "2.5 hours",
        "B": "3 hours",
        "C": "3.5 hours",
        "D": "4 hours"
      },
      "correct_answer": "B"
    },
    {
      "id": 14,
      "difficulty": "easy",
      "question": "🚴 Convert 10 m/s to km/hr.",
      "options": {
        "A": "30 km/hr",
        "B": "34 km/hr",
        "C": "36 km/hr",
        "D": "40 km/hr"
      },
      "correct_answer": "C"
    },
    {
      "id": 15,
      "difficulty": "easy",
      "question": "🚗 If speed doubles and time same, distance ___.",
      "options": { "A": "halves", "B": "doubles", "C": "same", "D": "triples" },
      "correct_answer": "B"
    },
    {
      "id": 16,
      "difficulty": "easy",
      "question": "⏱️ Time = 120 minutes, speed = 40 km/hr. Distance?",
      "options": { "A": "60 km", "B": "70 km", "C": "80 km", "D": "90 km" },
      "correct_answer": "C"
    },
    {
      "id": 17,
      "difficulty": "easy",
      "question": "🚶 Walking 6 km in 1.5 hours. Speed?",
      "options": {
        "A": "3 km/hr",
        "B": "4 km/hr",
        "C": "5 km/hr",
        "D": "6 km/hr"
      },
      "correct_answer": "B"
    },
    {
      "id": 18,
      "difficulty": "easy",
      "question": "🚗 Distance 400 km, time 8 hours. Speed?",
      "options": {
        "A": "45 km/hr",
        "B": "48 km/hr",
        "C": "50 km/hr",
        "D": "52 km/hr"
      },
      "correct_answer": "C"
    },
    {
      "id": 19,
      "difficulty": "easy",
      "question": "✈️ 1 km/hr = ___ m/s (approx).",
      "options": { "A": "0.278", "B": "0.333", "C": "0.444", "D": "0.555" },
      "correct_answer": "A"
    },
    {
      "id": 20,
      "difficulty": "easy",
      "question": "🚌 A bus travels 150 km at 50 km/hr. Time?",
      "options": {
        "A": "2.5 hours",
        "B": "3 hours",
        "C": "3.5 hours",
        "D": "4 hours"
      },
      "correct_answer": "B"
    },
    {
      "id": 21,
      "difficulty": "medium",
      "question": "🚗 A car travels at 70 km/hr for 2.5 hours, then at 50 km/hr for 1.5 hours. Total distance?",
      "options": { "A": "240 km", "B": "250 km", "C": "260 km", "D": "270 km" },
      "correct_answer": "B"
    },
    {
      "id": 22,
      "difficulty": "medium",
      "question": "🚶 A man walks 6 km/hr for 2 hours, then cycles 15 km/hr for 1 hour. Average speed?",
      "options": {
        "A": "8 km/hr",
        "B": "9 km/hr",
        "C": "10 km/hr",
        "D": "11 km/hr"
      },
      "correct_answer": "B"
    },
    {
      "id": 23,
      "difficulty": "medium",
      "question": "🚌 Two towns 240 km apart. Car A at 60 km/hr, Car B at 40 km/hr start towards each other. Meeting time?",
      "options": {
        "A": "2 hours",
        "B": "2.2 hours",
        "C": "2.4 hours",
        "D": "2.5 hours"
      },
      "correct_answer": "C"
    },
    {
      "id": 24,
      "difficulty": "medium",
      "question": "🏎️ A train 150 m long crosses a pole in 10 seconds. Speed in km/hr?",
      "options": {
        "A": "48 km/hr",
        "B": "52 km/hr",
        "C": "54 km/hr",
        "D": "56 km/hr"
      },
      "correct_answer": "C"
    },
    {
      "id": 25,
      "difficulty": "medium",
      "question": "🚗 A to B 120 km. Half at 40 km/hr, half at 60 km/hr. Average speed?",
      "options": {
        "A": "46 km/hr",
        "B": "48 km/hr",
        "C": "50 km/hr",
        "D": "52 km/hr"
      },
      "correct_answer": "B"
    },
    {
      "id": 26,
      "difficulty": "medium",
      "question": "🚶 A walks at 5 km/hr, B at 6 km/hr. A starts 30 min earlier. B catches A in ___ hours.",
      "options": { "A": "2", "B": "2.5", "C": "3", "D": "3.5" },
      "correct_answer": "B"
    },
    {
      "id": 27,
      "difficulty": "medium",
      "question": "🚌 A bus covers 3/5 distance at 40 km/hr, rest at 50 km/hr. Total distance 200 km. Average speed?",
      "options": {
        "A": "42 km/hr",
        "B": "44 km/hr",
        "C": "46 km/hr",
        "D": "48 km/hr"
      },
      "correct_answer": "B"
    },
    {
      "id": 28,
      "difficulty": "medium",
      "question": "✈️ Convert 108 km/hr to m/s.",
      "options": {
        "A": "28 m/s",
        "B": "30 m/s",
        "C": "32 m/s",
        "D": "34 m/s"
      },
      "correct_answer": "B"
    },
    {
      "id": 29,
      "difficulty": "medium",
      "question": "🚗 Speed increased by 25%, time same. Distance increase by ___%.",
      "options": { "A": "20%", "B": "25%", "C": "30%", "D": "35%" },
      "correct_answer": "B"
    },
    {
      "id": 30,
      "difficulty": "medium",
      "question": "🚌 Two buses 300 km apart. Speed 50 and 55 km/hr towards each other. Meeting time?",
      "options": {
        "A": "2.5 hours",
        "B": "2.73 hours",
        "C": "2.86 hours",
        "D": "3 hours"
      },
      "correct_answer": "C"
    },
    {
      "id": 31,
      "difficulty": "medium",
      "question": "🏎️ A train crosses a 200 m platform in 20 seconds at 72 km/hr. Train length?",
      "options": {
        "A": "160 m",
        "B": "180 m",
        "C": "200 m",
        "D": "220 m"
      },
      "correct_answer": "C"
    },
    {
      "id": 32,
      "difficulty": "medium",
      "question": "🚶 A to B 18 km. Speed 6 km/hr, returns at 4 km/hr. Average speed?",
      "options": {
        "A": "4.5 km/hr",
        "B": "4.8 km/hr",
        "C": "5 km/hr",
        "D": "5.2 km/hr"
      },
      "correct_answer": "B"
    },
    {
      "id": 33,
      "difficulty": "medium",
      "question": "🚗 Car covers 400 km in 8 hours. First 150 km at 50 km/hr. Remaining speed?",
      "options": {
        "A": "52 km/hr",
        "B": "54 km/hr",
        "C": "56 km/hr",
        "D": "58 km/hr"
      },
      "correct_answer": "C"
    },
    {
      "id": 34,
      "difficulty": "medium",
      "question": "✈️ A plane flies 2400 km in 4 hours. Speed in m/s?",
      "options": {
        "A": "150 m/s",
        "B": "160 m/s",
        "C": "166.67 m/s",
        "D": "170 m/s"
      },
      "correct_answer": "C"
    },
    {
      "id": 35,
      "difficulty": "medium",
      "question": "🚌 Distance 180 km. If speed increased by 10 km/hr, time reduced by 30 min. Original speed?",
      "options": {
        "A": "40 km/hr",
        "B": "45 km/hr",
        "C": "50 km/hr",
        "D": "55 km/hr"
      },
      "correct_answer": "B"
    },
    {
      "id": 36,
      "difficulty": "medium",
      "question": "🏎️ A car travels 60 km at 30 km/hr, 100 km at 50 km/hr, 40 km at 40 km/hr. Average speed?",
      "options": {
        "A": "38 km/hr",
        "B": "40 km/hr",
        "C": "42 km/hr",
        "D": "44 km/hr"
      },
      "correct_answer": "B"
    },
    {
      "id": 37,
      "difficulty": "medium",
      "question": "🚶 A beats B by 100 m in 1 km race. A speed 8 km/hr. B speed?",
      "options": {
        "A": "7.2 km/hr",
        "B": "7.4 km/hr",
        "C": "7.6 km/hr",
        "D": "7.8 km/hr"
      },
      "correct_answer": "A"
    },
    {
      "id": 38,
      "difficulty": "medium",
      "question": "🚗 Two cars start same time, speeds 45 and 60 km/hr. After 3 hours, distance between?",
      "options": { "A": "30 km", "B": "35 km", "C": "40 km", "D": "45 km" },
      "correct_answer": "D"
    },
    {
      "id": 39,
      "difficulty": "medium",
      "question": "✈️ Convert 25 m/s to km/hr.",
      "options": {
        "A": "80 km/hr",
        "B": "85 km/hr",
        "C": "90 km/hr",
        "D": "95 km/hr"
      },
      "correct_answer": "C"
    },
    {
      "id": 40,
      "difficulty": "medium",
      "question": "🚌 A bus travels 120 km in 2 hours, stops 30 min, then travels 150 km in 2.5 hours. Average speed including stop?",
      "options": {
        "A": "48 km/hr",
        "B": "50 km/hr",
        "C": "52 km/hr",
        "D": "54 km/hr"
      },
      "correct_answer": "D"
    },
    {
      "id": 41,
      "difficulty": "hard",
      "question": "🚗 A to B 150 km. Car covers at 50 km/hr, returns at 30 km/hr. Average speed?",
      "options": {
        "A": "35 km/hr",
        "B": "36 km/hr",
        "C": "37.5 km/hr",
        "D": "40 km/hr"
      },
      "correct_answer": "C"
    },
    {
      "id": 42,
      "difficulty": "hard",
      "question": "🚶 Two men start same time from P and Q 60 km apart. Speeds 4 and 6 km/hr. Meeting time?",
      "options": {
        "A": "5 hours",
        "B": "6 hours",
        "C": "7 hours",
        "D": "8 hours"
      },
      "correct_answer": "B"
    },
    {
      "id": 43,
      "difficulty": "hard",
      "question": "🏎️ A train 200 m long crosses another 300 m long at 72 km/hr in opposite direction in 25 seconds. Speed of second train?",
      "options": {
        "A": "36 km/hr",
        "B": "40 km/hr",
        "C": "44 km/hr",
        "D": "48 km/hr"
      },
      "correct_answer": "A"
    },
    {
      "id": 44,
      "difficulty": "hard",
      "question": "🚗 A car covers distance in 4 hours at 60 km/hr. To cover same in 3 hours, speed increase?",
      "options": {
        "A": "15 km/hr",
        "B": "18 km/hr",
        "C": "20 km/hr",
        "D": "22 km/hr"
      },
      "correct_answer": "C"
    },
    {
      "id": 45,
      "difficulty": "hard",
      "question": "✈️ A plane flies 3000 km in 5 hours with wind. Against wind, 6 hours for same. Wind speed?",
      "options": {
        "A": "40 km/hr",
        "B": "45 km/hr",
        "C": "50 km/hr",
        "D": "55 km/hr"
      },
      "correct_answer": "C"
    },
    {
      "id": 46,
      "difficulty": "hard",
      "question": "🚌 Two stations 240 km apart. Trains start same time, speeds 50 and 70 km/hr towards each other. Distance from slower train when they meet?",
      "options": { "A": "90 km", "B": "100 km", "C": "110 km", "D": "120 km" },
      "correct_answer": "B"
    },
    {
      "id": 47,
      "difficulty": "hard",
      "question": "🏎️ A car covers 1/3 at 40 km/hr, 1/4 at 50 km/hr, rest at 60 km/hr. Total distance 360 km. Average speed?",
      "options": {
        "A": "48 km/hr",
        "B": "50 km/hr",
        "C": "52 km/hr",
        "D": "54 km/hr"
      },
      "correct_answer": "B"
    },
    {
      "id": 48,
      "difficulty": "hard",
      "question": "🚶 A walks 5 km/hr, B 6 km/hr. A starts 2 hours earlier. B catches A in ___ hours after B starts.",
      "options": { "A": "8", "B": "9", "C": "10", "D": "11" },
      "correct_answer": "C"
    },
    {
      "id": 49,
      "difficulty": "hard",
      "question": "🚗 A to B 180 km. Speed reduced by 10 km/hr, time increases 1 hour. Original speed?",
      "options": {
        "A": "40 km/hr",
        "B": "45 km/hr",
        "C": "50 km/hr",
        "D": "55 km/hr"
      },
      "correct_answer": "B"
    },
    {
      "id": 50,
      "difficulty": "hard",
      "question": "✈️ Convert 144 km/hr to m/s.",
      "options": { "A": "38 m/s", "B": "40 m/s", "C": "42 m/s", "D": "44 m/s" },
      "correct_answer": "B"
    },
    {
      "id": 51,
      "difficulty": "hard",
      "question": "🚌 Two buses same direction. Faster 60 km/hr, slower 45 km/hr. Faster passes slower in 1 minute. Length of faster if slower is 50 m?",
      "options": { "A": "75 m", "B": "80 m", "C": "85 m", "D": "90 m" },
      "correct_answer": "A"
    },
    {
      "id": 52,
      "difficulty": "hard",
      "question": "🏎️ A train crosses two bridges 200 m and 300 m in 40 and 50 seconds. Train length?",
      "options": {
        "A": "100 m",
        "B": "120 m",
        "C": "140 m",
        "D": "160 m"
      },
      "correct_answer": "B"
    },
    {
      "id": 53,
      "difficulty": "hard",
      "question": "🚗 Distance 400 km. If speed increased by 20 km/hr, time reduced by 1 hour. Original speed?",
      "options": {
        "A": "60 km/hr",
        "B": "65 km/hr",
        "C": "70 km/hr",
        "D": "80 km/hr"
      },
      "correct_answer": "D"
    },
    {
      "id": 54,
      "difficulty": "hard",
      "question": "🚶 A and B 100 km apart. Speeds 6 and 4 km/hr towards each other. After meeting, return to original places. Total distance A travels?",
      "options": { "A": "110 km", "B": "115 km", "C": "120 km", "D": "125 km" },
      "correct_answer": "C"
    },
    {
      "id": 55,
      "difficulty": "hard",
      "question": "✈️ A plane's speed in still air 500 km/hr. Wind 50 km/hr. Time for 1650 km with wind?",
      "options": {
        "A": "2.8 hours",
        "B": "3 hours",
        "C": "3.2 hours",
        "D": "3.4 hours"
      },
      "correct_answer": "B"
    },
    {
      "id": 56,
      "difficulty": "hard",
      "question": "🚌 A bus travels 240 km. If speed increased by 5 km/hr, time reduced by 40 minutes. Original speed?",
      "options": {
        "A": "40 km/hr",
        "B": "45 km/hr",
        "C": "50 km/hr",
        "D": "55 km/hr"
      },
      "correct_answer": "B"
    },
    {
      "id": 57,
      "difficulty": "hard",
      "question": "🏎️ A car travels 1/2 at 40 km/hr, 1/3 at 60 km/hr, rest at 80 km/hr. Total distance 600 km. Average speed?",
      "options": {
        "A": "50 km/hr",
        "B": "52 km/hr",
        "C": "54 km/hr",
        "D": "56 km/hr"
      },
      "correct_answer": "C"
    },
    {
      "id": 58,
      "difficulty": "hard",
      "question": "🚶 A is twice as fast as B. B starts 2 hours earlier. A catches B in ___ hours after A starts.",
      "options": { "A": "2", "B": "3", "C": "4", "D": "5" },
      "correct_answer": "A"
    },
    {
      "id": 59,
      "difficulty": "hard",
      "question": "🚗 Two cars 300 km apart. Speeds 45 and 55 km/hr towards each other. After meeting, they continue to original places. Total distance when they meet second time?",
      "options": { "A": "400 km", "B": "450 km", "C": "500 km", "D": "550 km" },
      "correct_answer": "B"
    },
    {
      "id": 60,
      "difficulty": "hard",
      "question": "✈️ A boat downstream 18 km in 2 hours, upstream 12 km in 3 hours. Boat speed in still water?",
      "options": {
        "A": "6 km/hr",
        "B": "6.5 km/hr",
        "C": "7 km/hr",
        "D": "7.5 km/hr"
      },
      "correct_answer": "D"
    }
  ]
}