A sound wave travels at 330 m/s. How long does it take to cover a distance of 3.3 km? MCQ with Answer and Explanation
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Question #1
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A cargo train 120 meters long crosses a warehouse tunnel in 24 seconds. If the train speed is 60 km/h, find the absolute length of the tunnel.
Correct Answer: Option C
Explanation:
Speed of train = 60 * (5/18) = 50/3 m/s. Total distance handled in 24 seconds = (50/3) * 24 = 400 meters. Length of tunnel = 400 - 120 = 280 meters.
Speed of train = 60 * (5/18) = 50/3 m/s. Total distance handled in 24 seconds = (50/3) * 24 = 400 meters. Length of tunnel = 400 - 120 = 280 meters.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A person wins a 100-meter race in 12 seconds, while the runner-up finishes in 13 seconds. By what distance did the winner beat the runner-up?
Correct Answer: Option A
Explanation:
Speed of runner-up = 100 / 13 m/s. Distance covered by runner-up in 12 seconds = (100 / 13) * 12 = 1200 / 13 = 92.31 meters. Beat distance = 100 - 92.31 = 7.69 meters.
Speed of runner-up = 100 / 13 m/s. Distance covered by runner-up in 12 seconds = (100 / 13) * 12 = 1200 / 13 = 92.31 meters. Beat distance = 100 - 92.31 = 7.69 meters.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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Two trains 150m and 170m long are running towards each other on parallel tracks at speeds of 42 km/h and 30 km/h respectively. In what time will they clear each other?
Correct Answer: Option A
Explanation:
Total distance = 150 + 170 = 320 meters. Relative speed = 42 + 30 = 72 km/h = 72 * (5/18) = 20 m/s. Time taken = 320 / 20 = 16 seconds.
Total distance = 150 + 170 = 320 meters. Relative speed = 42 + 30 = 72 km/h = 72 * (5/18) = 20 m/s. Time taken = 320 / 20 = 16 seconds.
This question belongs to:
Maths
Time Speed and Distance
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