Multiple choice

A 200 meters long train crosses a bridge 400 meters long in 40 seconds. What is speed (in km/h) of the train?

  1. 70

  2. 72

  3. 54

  4. 65
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Total distance covered = length of train + length of bridge = 200 + 400 = 600 m. Time taken = 40 seconds. Speed in m/s = 600/40 = 15 m/s. Converting to km/h: multiply by 18/5 or 3.6, giving 15 × 3.6 = 54 km/h. The train must travel its own length plus the bridge length to completely cross the bridge.

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