Lessons

General Aptitude
1.3 Problems on Trains - Data Sufficiency 2

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Q.

What is the speed of the train?
1.The train crosses a signal pole in 18 seconds.
2.The train crosses a platform of equal length in 36 seconds.
3.Length of the train is 330 metres.

View Answer

Correct choice: D

Explanation:

Let the speed of the train be x metres/sec.

Time taken to cross a signal pole = Length of the train
Speed of the train
Time taken to cross a platform = (Length of the train + Length of the Platform)
Speed of the train

Length of train = 330 m.

I and III give, 18 = 330     x = 330 m/sec = 55 m/sec.
x 18 3
II and III give, 36 = 2 x 330     x = 660 m/sec = 55 m/sec.
x 36 3

Correct answer is (D).

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