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Question

# 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.

A
I only
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B
II only
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C
III only
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D
All I, II and III are required
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E
Even with I, II and III, the answer cannot be obtained.
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Solution

## The correct option is E Even with I, II and III, the answer cannot be obtained.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)Relative speed⇒18=(180+x)Relative speedThus, even with I, II and III, the answer cannot be obtained.∴ Correct answer is (E).

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