Multiple choice

A train passes over a 400 m long bridge. If the speed of the train is 30 m/s and the train takes 20 s to cross the bridge, find the length of the train

  1. 400 m

  2. 600 m

  3. 800 m

  4. 200 m
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D Correct answer
Explanation

Total distance covered by the train to cross the bridge = Length of train + Length of bridge. Distance = Speed * Time = 30 m/s * 20 s = 600 m. Length of train = 600 - 400 = 200 m.

AI explanation

Using the formula for crossing a bridge, the total distance covered is the speed multiplied by the time, which is 30 m/s multiplied by 20 s to equal 600 m. Because this total distance equals the train length plus the 400 m bridge, the train length is 600 m minus 400 m, resulting in 200 m.

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