Multiple choice

A train crosses a pole in 12 sec, and a bridge of length 170 m in 36 sec. Then the speed of the train is:

  1. 10.8 km/h

  2. 30.75 km/h

  3. 25.5 km/h

  4. 32.45 km/h
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Let train length = L meters and speed = s m/s. Crossing pole: L = 12s. Crossing bridge: L + 170 = 36s. Substituting: 12s + 170 = 36s, so 24s = 170, s = 7.08 m/s. Converting to km/h: 7.08 × (3600/1000) = 25.5 km/h.

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