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 46 km/hour and 36 km/hour. The faster train passes the slower train in 36 seconds. The length of each train is

Let the length of each train be x metre.
Relative speed = (46 – 36) kmph = 10 kmph

=		10 × 5		m./sec.
		18

=	25	m./sec.
	9

∴ 2x = 36 ×	25	= 100
	9

⇒ x =	100	= 50 metre
	2