Multiple choice general knowledge math & puzzles

A train of 77m length is running at a speed of 60 km/hour. If it crosses a bridge in 30 seconds, then find the length of the bridge.

  1. 403 m

  2. 423 m

  3. 412 m

  4. 396 m
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B Correct answer
Explanation

First convert speed: 60 km/h = 60 × (1000/3600) = 16.67 m/s. Distance covered in 30 seconds = 16.67 × 30 = 500 m. This distance equals train length + bridge length, so bridge = 500 - 77 = 423 m. The train's length must be added to the bridge length when calculating total crossing distance.

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