How much time will the train A take to cross another train B running in opposite direction I Train A...........

Quantitative Aptitude ( CCS) Data Sufficiency

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How much time will the train A take to cross another train B running in opposite direction?

I. Train A crosses a signal pole in 7s

II. Ratio of the speed of trains A and B is 3:5

III. Length of two trains together is 500m

Only I

Only II

Only III

Only I and II

All the given statements are Insufficient

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Explanation:

From Statement I, Time taken by Train A crosses a signal pole = 7s
From Statement II, Speed of Train A and Train B = 3x and 5x,Relative speed= 8x
From Statement I and Statement II. A Train’s length = 21x
B Train’s length = 500 – 21x
Time taken by A to cross B = [500-21x]+21x/8x
All the given statements are Insufficient to answer the question.

Hence, option 5 is the correct answer.