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Question

The given question consists of a set of statements. Find out whether the data provided in the statements are sufficient to answer the question and then mark the appropriate option.

How much time will the train X take to cross another train Y running in opposite direction?

I. Train X crosses a lamp post in 9 seconds.

II. Ratio of the speeds of trains X and Y is 3:2.

III. Length of the two trains together is 750 metres.


A

I only

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B

II only

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C

I or II only

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D

Cannot be determined

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Solution

The correct option is D

Cannot be determined


II. Let the speeds of A and B be `3x' m / sec and `2x' m / sec.

I. Length of train X = (3x × 9) m = 27x metres.

III. Length of train Y = (750 - 27x) m.

Relative speed = (3x + 2x) m/sec = 5x m/sec.

Time taken by X to cross Y=Sum of their lengthsRelativespeed=7505xsec.

Thus, even with the information in all the three statements, question remains unanswered.


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