Multiple choice

A train 110 m long is running with a speed of 60 km/hr. What is the time in which it will pass a man who starts from the engine running at the speed of 6 km/hr in the direction opposite to that of the train?

  1. 5 sec.

  2. 6 sec.

  3. 10 sec.

  4. 15 sec.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Relative speed = 60 + 6 = 66 km/hr = 66 × 1000/3600 = 55/3 m/s. The train must cover its own length of 110 m relative to the man. Time = distance/speed = 110/(55/3) = 6 seconds. This makes sense because they're moving toward each other, increasing effective speed.

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