If X works 3 times as fast as Y and is a...

If X works 3 times as fast as Y and is able to complete, a work in 40 days less than the number of days taken by Y, then find the time in which they can complete the work working together.

A

15 days

B

10 days

C

`7 (1)/(2)` days

D

5 days

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The correct Answer is:

A

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