Multiple choice

A 270 m long train is moving at the speed of 25 kmph. It will cross a man coming from the opposite direction at the speed of 2 kmph in

  1. 24 sec

  2. 30 sec

  3. 36 sec

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Relative speed = 25 + 2 = 27 kmph. Convert to m/s: 27 * (5/18) = 7.5 m/s. Time = Distance / Speed = 270 / 7.5 = 36 seconds.

AI explanation

Because the train and the man are moving in opposite directions, their relative speed is the sum of their speeds, which is 25 kmph plus 2 kmph, equaling 27 kmph. Converting this to meters per second by multiplying by 5/18 gives a relative speed of 7.5 m/s. The time taken to cross the man is the train's length divided by this relative speed, which is 270 m divided by 7.5 m/s, resulting in 36 sec.

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