Multiple choice

A train passes a station platform in 60 seconds and a man standing on the platform in 25 seconds. If the speed of the train is 72 km/hr, what is the length of the platform?

  1. 1200 m

  2. 1000 m

  3. 700 m

  4. 500 m
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Speed = 72 km/hr = 20 m/sec. Train length = 20 * 25 = 500 m. Total distance (train + platform) = 20 * 60 = 1200 m. Platform length = 1200 - 500 = 700 m.

AI explanation

A speed of 72 km/hr converts to 72 x (5/18) = 20 m/s. Crossing a man means the train covers its own length, so the train is 20 m/s x 25 seconds = 500 m long. Crossing the platform means covering the train's length plus the platform's length, which equals 20 m/s x 60 seconds = 1200 m. Therefore, the length of the platform is 1200 m - 500 m = 700 m. The result is 700 m.

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