A 252 m long train is running at a speed of 125 km/h. What is the time (in seconds) in which it will pass a man who starts from the engine running at the speed of 17 km/h in the same direction as that of the train?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 8.4.
The train's speed = 125 km/h
The man's speed = 17 km/h
Since both are moving in the same direction, the relative speed of the train with respect to the man = 125 km/h − 17 km/h = 108 km/h
Relative speed in m/s = 108 × 5/18 = 30 m/s
The length of the train = 252 meters
The relative speed = 30 m/s
The time taken for the train to pass the man = Distance/Speed = 252/30 = 8.4 seconds