A 600-meter-long train crosses a man walking in the opposite direction in 20 seconds. If the speed of the train is 5 times the speed of a man, then what is the speed of the train?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 90 km/hr.
Let the speed of the man be x meters per second
The train and the man are moving in opposite directions,
Relative speed = x + 5x = 6x
We know that,
Distance = speed × time
⇒ 600 = 6x × 20
⇒ 6x = 600/20
⇒ 6x = 30
⇒ x = 5
Thus, the speed of the man is 5 meters per second
The speed of the train = 5x = 25 m/sec and 90 km/hr