Multiple choice

The time taken by train 360 m long travelling at 21 Kmph, in passing a person walking in the same direction at 3 kmph, will be:

  1. 74 Sec

  2. 73 Sec

  3. 72 Sec

  4. 71 Sec
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Relative speed = 21 - 3 = 18 Kmph = 18 * (5/18) = 5 m/s. Time = Distance / Speed = 360 / 5 = 72 seconds.

AI explanation

Using the relative speed formula for objects moving in the same direction, subtract the speeds to get 21 kmph minus 3 kmph equals 18 kmph. Convert this to meters per second by multiplying by 5/18, which gives 5 m/s. To pass the person, the train must cover its own length of 360 m, so divide 360 by 5 to find the time of 72 seconds. The time taken is 72 sec.

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