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

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

1.	A and B can together do a piece of work in 15 days. B alone can do it 20 days. In how many days can A alone do it ?
A.	30 days
B.	40 days
C.	45 days
D.	60 days
Answer» E.

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