A 150 meter long train crosses a man walking at the speed of 6 kmph in the opposite direction in 6 seconds. The speed of the train in km/hr is?
Correct Answer: 84
Explanation:
Let the speed of the train be v km/hr
Relative speed of the train = (v + 6) km/hr = [(v + 6) x 5/18] m/sec
∵ 150/6 = (v + 6) x (5/18)
⇒ 5v + 30 = 450
∴ v = 84 km/hr
