Multiple choice

A goods train crosses a 150 meters long platform in 40 seconds and a man standing on the platform in 10 seconds. Find the length of the train.

  1. 100 m

  2. 50 m

  3. 175 m

  4. 150 m
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Train length L, speed S. Crossing a man: L = 10S (train travels its own length in 10 sec). Crossing platform: L + 150 = 40S. Substituting: 10S + 150 = 40S, so 30S = 150, S = 5 m/s. Then L = 10 × 5 = 50 m. The train takes 10 seconds to pass a stationary point, so its speed equals its length/10.

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