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Discussion :: Problems on Trains

1. 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.

2. A.

I only

B.

II only

C.

III only

D.

All I, II and III are required

E.
 Even with I, II and III, the answer cannot be obtained.

Answer : Option E

Explanation :

Let the length of the train P be x metres.

I. These trains are running in opposite directions.

II. Length of the train Q is 180 m.

 III. Time taken by P to cross Q = $$\frac { (180 +X) } { Relative speed }$$     18 =$$\frac { (180 +X) } { Relative speed }$$

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

Correct answer is (E).

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