Multiple choice

A train passes over a $400$ $\mathrm { m }$ long bridge. If the speed of thetrain is $300$$\mathrm { m } / \mathrm { s }$ and the train takes $2$ $\mathrm { s }$ to cross the bridge, find the length of the train.

  1. $400$ $\mathrm { m }$
  2. $600$  $\mathrm { m }$
  3. $800$ $\mathrm { m }$
  4. $200$ $\mathrm { m }$
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D Correct answer
Explanation

Distance = speed * time. Distance = length of train + length of bridge. (L + 400) = 300 * 2 = 600. L = 600 - 400 = 200 m.

AI explanation

Using the formula for total distance covered which is the sum of the train's length and the bridge's length, we multiply the speed by the time: 300 m/s * 2 s = 600 m. Subtracting the 400 m bridge from this total distance gives the train's length: 600 m - 400 m = 200 m.

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