Lessons

General Aptitude
1.4 Problems on Trains - Data Sufficiency 3

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Q.

What is the length of a running train P crossing another running train Q?

I. 

These two trains take 18 seconds to cross each other.

II. 

These trains are running in opposite directions.

 III. 

The length of the train Q is 180 metres.

View Answer

Correct choice: D

Explanation:

Let the length of the train P be x metres.

 II. These trains are running in opposite directions.

III. Length of the train Q is 180 m.

  I. Time taken by P to cross Q = (180 + x)     18 = (180 + x)
Relative speed Relative speed

Thus, even with I, II and III, the answer cannot be obtained.

Correct answer is (E).

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