A and B can together do a piece of work in 15 days. B alone can do it in 20 days

Question

A and B can together do a piece of work in 15 days. B alone can do it in 20 days. In how many days can A alone do it ?

Options:

A . 40 days

B . 50 days

C . 60 days

D . 70 days

Answer: Option C
(A+B)’S 1 DAY’S WORK = [1/15−1/20]=1/60
A ALONE CAN FINISH IT IN 60 DAYS

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