Anil can do a work in 15 days while Sunil can do it in 25 days. How long will they take if both work together?

 Anil can do a work in 15 days while Sunil can do it in 25 days. How long will they take if both work together?

A). 3 4/9 days

B). 8 4/9 days

C). 9 3/8 days

D). 6 3/8 days

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