Multiple choice

A train crosses a 50 meter platform in 14 seconds and crosses a man standing on the platform in 10 seconds. Find the speed of the train in km/h?

  1. 45

  2. 24

  3. 36

  4. 40
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A Correct answer
Explanation

Train crosses a man in 10 seconds, so train length = speed × 10. Train crosses 50m platform in 14 seconds, so train length + 50 = speed × 14. Solving: speed × 14 - speed × 10 = 50, so speed × 4 = 50, giving speed = 12.5 m/s. Converting to km/h: 12.5 × 18/5 = 45 km/h.

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