Two trains of equal length are running on parallel lines

Two trains of equal length are running on parallel lines in the same direction at the rate of 46 km/hr and 36 km/hr. The faster train passes the slower train in 36 seconds. The length of each train is

Length of each train = x metre
Relative speed = 46 – 36 = 10 kmph

=		10 ×	5		m/sec
			18

=	25	m/sec
	9

∴ Time taken in crossing =	Length of both trains
	Relative speed

⇒ 2x = 36 ×	25	= 100
	9

⇒ x =	100	= 50 metre
	2