Multiple choice

A 130 m long train crosses a 245 m. long bridge in 30 seconds. What is the speed of train per hour?

  1. 75 km/h

  2. 50 km/h

  3. 60 km/h

  4. 45 km/h

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The total distance covered is the sum of the train length and bridge length: 130 m + 245 m = 375 m. Speed = distance/time = 375/30 = 12.5 m/s. Converting to km/h: 12.5 × 3.6 = 45 km/h. The key insight is that the train must completely clear the bridge, so we add both lengths.

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