A man covers 1/3 of his journey by bus at 30 km/h, 1/3 by train at 60 km/h and the last 1/3 by scooter at 20 km/h. Find his average speed for the whole journey. MCQ with Answer and Explanation
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Question #1
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A sound wave travels at a speed of 340 m/s. Find the distance covered by the wave in 0.5 minutes.
Correct Answer: Option A
Explanation:
Time = 0.5 minutes = 30 seconds. Distance = Speed * Time = 340 * 30 = 10200 meters = 10.2 km.
Time = 0.5 minutes = 30 seconds. Distance = Speed * Time = 340 * 30 = 10200 meters = 10.2 km.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A train 150 meters long passes a platform 250 meters long in 20 seconds. Find the speed of the train in km/h.
Correct Answer: Option B
Explanation:
Total distance = 150 + 250 = 400 meters. Speed = 400 / 20 = 20 m/s. In km/h = 20 * (18/5) = 72 km/h.
Total distance = 150 + 250 = 400 meters. Speed = 400 / 20 = 20 m/s. In km/h = 20 * (18/5) = 72 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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Two express trains 220 meters and 180 meters long are tracking parallel in identical directions at speeds of 90 km/h and 72 km/h. Find the duration to pass each other.
Correct Answer: Option C
Explanation:
Total distance = 220 + 180 = 400 meters. Relative speed in identical direction = 90 - 72 = 18 km/h = 5 m/s. Time taken = 400 / 5 = 80 seconds.
Total distance = 220 + 180 = 400 meters. Relative speed in identical direction = 90 - 72 = 18 km/h = 5 m/s. Time taken = 400 / 5 = 80 seconds.
This question belongs to:
Maths
Time Speed and Distance
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