Lessons

General Aptitude
1.2 Problems on Trains - Data Sufficiency 1

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Q.

What is the speed of the train whose length is 210 metres?
1.The train crosses another train (Howrah Express/12869) of 300 metres length running in opposite direction in 10 seconds. 
2.The train crosses another train (Howrah Express/12869) running in the same direction at the speed of 60 km/hr in 30 seconds.

View Answer

Correct choice: D

Explanation:

Time taken to cross the train,
running in opposite directions
= (l1 + l2) sec.
(u + v)
10 = (210 + 300)
(u + v)

   u + v = 51.

Time taken to cross the train, running in same direction = (l1 + l2) sec.
(u - v)
30 = (210 + 300)
(u - 60 x (5/18))
u = 17 + 50 m/sec.
3

Thus, u and v can be obtained.

Correct answer is (E).

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