Multiple choice

Find the time taken by a train 180 m long, traveling at 42 km/hr, in passing a man walking in the same direction at 6 km/

  1. 15 sec

  2. 18 sec

  3. 21 sec

  4. 25 sec
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Relative speed of train and man = (42 - 6) km/hr = 36 km/hr = 10 m/s. Time to pass = Distance / Relative speed = 180 m / 10 m/s = 18 seconds. The train is traveling faster than the man, so we subtract their speeds.

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