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X works 3 times as fast as Y and is able...

X works 3 times as fast as Y and is able to complete a work in40 days less than the number of days taken by Y. Find the time in which they can complete the work together.

A

15 days

B

10 days

C

7`1/2` days

D

5 days

Text Solution

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The correct Answer is:
A
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