Multiple choice

A train crosses a bridge and a platform of length 450 m and 700 m in 20 sec and 30 secrespectively. Find the speed of the train.

  1. 25 m/s

  2. 26 m/s

  3. 25.5 m/s

  4. 27 m/s

  5. 28 m/s
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A Correct answer
Explanation

Let speed be v and train length be L. L + 450 = 20v and L + 700 = 30v. Subtracting equations: 250 = 10v, so v = 25 m/s.

AI explanation

Let the length of the train be L and its speed be S. The equations for crossing the bridge and the platform are L plus 450 equals 20 times S, and L plus 700 equals 30 times S. Subtracting the first equation from the second gives 250 equals 10 times S, which means the speed is 25 m/s. The speed of the train is 25 m/s.

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