'A'can do a piece of work in 10 days and'B'can do the same work in 15 days. How long will it take ifboth work together ?

 'A'can do a piece of work in 10 days and'B'can do the same work in 15 days. How long will it take ifboth work together ?

A). 6 days

B). 7 days

C). 8 days

D). 9 days

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