Two trains A and B travel from points X to Y and the ratio of the speeds of A to that of B is 2 : 7. Find the ratio of time taken by A and B to reach From X to Y.

2 : 5
3 : 5
3 : 8
7 : 2

Correct Answer: 7 : 2

Explanation:

We know that speed is inversely proportional to time.
Given that, (Speed of A ) : (speed of B ) = 2 : 7
∴(Time taken by A ) : (Time taken by B ) = 1/2 : 1/7 = 7 : 2

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