Two trains 140 m and 160 m long run at the speed of 60 km/hr and 40 km/hr respectively in opposite directions on parallel tracks. The time (in seconds) which they take to cross each other, is:

1.

Two trains 140 m and 160 m long run at the speed of 60 km/hr and 40 km/hr respectively in opposite directions on parallel tracks. The time (in seconds) which they take to cross each other, is:

[A].	9
[B].	9.6
[C].	10
[D].	10.8

Answer: Option D

Explanation:

Relative speed = (60 + 40) km/hr =		100 x	5	m/sec	=		250	m/sec.
			18				9

Distance covered in crossing each other = (140 + 160) m = 300 m.

Required time =		300 x	9	sec	=	54	sec = 10.8 sec.
			250			5

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