A train, 240 m long crosses a man walking along the line

A train, 240 m long crosses a man walking along the line in opposite direction at the rate of 3 kmph in 10 seconds. The speed of the train is

If the speed of train be x kmph then,
Its relative speed = (x + 3) kmph

∴ Time =	Length of the train
	Relative Speed

⇒	10
	3600

=	240
	1000(x + 3)

⇒ x + 3 = 86.4
⇒ x = 83.4 kmph