Multiple choice general knowledge math & puzzles

A train 360 m long is running at a speed of 45 km/hr. In what time will it pass a bridge 140 m long?

  1. 40 sec

  2. 42 sec

  3. 45 sec

  4. 48 sec
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

To pass the bridge completely, the train must travel its own length plus the bridge length: 360 m + 140 m = 500 m. Speed of 45 km/hr = 45 × (5/18) = 12.5 m/s. Time = Distance / Speed = 500 m / 12.5 m/s = 40 seconds. Option B (42 sec) would require incorrect speed conversion.

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