Lessons

General Aptitude
1.2 Problems on Trains - Data Sufficiency 1

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Q.

What is the length of a running train crossing another 180 metre long train running in the opposite direction?
1.The relative speed of the two trains was 150 kmph.
2.The trains took 9 seconds to cross each other.

View Answer

Correct choice: 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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