If A and B together can complete a piece of work in 15 days and B alone in 20 days, in how many days can A alone complete the work?

If A and B together can complete a piece of work in 15 days and B alon

1.	If A and B together can complete a piece of work in 15 days and B alone in 20 days, in how many days can A alone complete the work?
A.	60
B.	45
C.	40
D.	30
Answer» B. 45