Problems on Trains - Data Intensity 2 :: Discussion


2.What is the length of a running train?
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:

Time taken by train to cross a man = Length of train        Speed = l ....(i)
Speed of train 9
Time taken by train
to cross a platform =
(Length of train +
Length of platform)
      Speed = l + 240 ....(ii)
Speed of train 24
From (i) and (ii), we get l = l + 240 .
9 24

Thus, l can be obtained. So both I and II are necessary to get the answer.

 The correct answer is (D).

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Published by:Michael Daani

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