A train 100 metres long meets a man going in opposite direction

A train 100 metres long meets a man going in opposite direction at 5 km/hr and
passes him in 7 1 seconds.
5
What is the speed of the train (in km/hr) ?

Let speed of train be x kmph
Relative speed = (x + 5) kmph

Length of train =	100	km
	1000

=	1	km
	10

=	36
	5 × 60 × 60

⇒	1	=	1
	10(x +5)		500

⇒ x + 5 = 50
⇒ x = 45 kmph

passes him in 7	1	seconds.
	5