If 'A' is thrice as fast as B, and is therefore able to finish a work in 40 days less than B, find the time in which they can do it working together.

 If 'A' is thrice as fast as B, and is therefore able to finish a work in 40 days less than B, find the time in which they can do it working together.

A). 6 days

B). 9 days

C). 11 days

D). 15 days

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