Multiple choice general knowledge math & puzzles

The length of the bridge, which a train 130 metres long and travelling at 45 km/hr can cross in 30 seconds, is:

  1. 235

  2. 225

  3. 245

  4. 250
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C Correct answer
Explanation

Convert speed: 45 km/hr = 45 × 5/18 = 12.5 m/s. Distance covered in 30 seconds = 12.5 × 30 = 375m. This equals train length + bridge length, so bridge = 375 - 130 = 245m.

AI explanation

45 km/hr converts to 12.5 m/s (45×5/18). In 30 seconds the train covers 12.5×30=375 m, which is the combined length of the train and the bridge. Subtracting the train's own 130 m length gives a bridge length of 245 m.

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