Multiple choice

A 180 m long train takes 20 seconds to cross a pole. In how much time will it cross a platform 216 m long?

  1. 44 seconds

  2. 24 seconds

  3. 40 seconds

  4. 36 seconds

  5. None of these
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A Correct answer
Explanation

The speed of the train is 180 m / 20 s = 9 m/s. To cross a 216 m platform, the train must cover its own length plus the platform length, which is 180 + 216 = 396 m. The time taken is 396 m / 9 m/s = 44 seconds.

AI explanation

First, find the speed of the train by dividing its length by the time it takes to cross a pole: 180 m divided by 20 s equals 9 m/s. When crossing a 216 m platform, the total distance the train must travel is 180 m + 216 m = 396 m. The time required is calculated by dividing the total distance by the speed: 396 m divided by 9 m/s equals 44 seconds.

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