Multiple choice

A train going at the speed of 90 kmph crosses a platform in 9 seconds. If the length of the train is 100 m, what will be the length of the platform?

  1. 80 m

  2. 100 m

  3. 125 m

  4. 180 m

  5. 225 m
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Speed = 90 kmph = 90 * (5/18) m/s = 25 m/s. Total distance = Speed * Time = 25 * 9 = 225 m. Since the train length is 100 m, the platform length is 225 - 100 = 125 m.

AI explanation

First, convert the train speed from kmph to m/s by multiplying 90 by 5/18, which gives 25 m/s. The total distance covered in 9 seconds is 25 times 9, equaling 225 meters. Since the total distance is the sum of the train length and the platform length, subtract the train length of 100 meters from 225 meters. The result is 125 m.

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