Multiple choice

A 200 metres long train is running at a speed of 20 m/s. In how much time (in seconds) will it cross a 400 m long bridge?

  1. 20

  2. 25

  3. 30

  4. 60
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Total distance to cover = length of train + length of bridge = 200 + 400 = 600 m. Time = distance / speed = 600 / 20 = 30 seconds.

AI explanation

The total distance the train must cover to completely cross the bridge is the sum of its own length and the length of the bridge, which is 200 metres plus 400 metres, equaling 600 metres. Using the formula time equals distance divided by speed, we divide 600 metres by the given speed of 20 metres per second. This calculation yields a time of 30 seconds.

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