Multiple choice

A train, 300 m long, is travelling at a certain speed. It crosses a platform in 50 sec and a man standing on the platform in 20 sec. What is the length of the platform?

  1. 400 m

  2. 450 m

  3. 540 m

  4. 510 m

  5. None of these
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B Correct answer
Explanation

The speed of the train is 300m / 20s = 15 m/s. Crossing the platform takes 50s, so the total distance covered is 15 * 50 = 750m. Subtracting the train length (300m) gives a platform length of 450m.

AI explanation

The train's speed is found by dividing its length by the time it takes to cross the man, which is 300 m divided by 20 s, yielding 15 m/s. When crossing the platform, the total distance covered is this speed multiplied by 50 s, giving 750 m. The length of the platform is this total distance minus the train's length (750 m minus 300 m), resulting in 450 m.

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