Problems on Trains - Data Intensity 2 Questions and Answers Discussion Page.

1.	What is the length of a running train crossing another 180 metre long train running in the opposite direction?
	A.	I alone sufficient while II alone not sufficient to answer
	B.	II alone sufficient while I alone not sufficient to answer
	C.	Either I or II alone sufficient to answer
	D.	Both I and II are necessary to answer

Answer: Option D

Explanation:

Let the two trains of length a metres and b metres be moving in opposite directions at u m/s and v m/s.

Time taken to cross each other =	(a + b)	sec.
	(u + v)

Now, b = 180, u + v =		150 x	5	m/sec	=	125	m/sec.
			18			3

9 =	a + 180
	(125/3)

a = (375 - 180) = 195 m.

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Published by:Michael Daani

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