A and B together can do a piece of work in 12 days while A alone can do the same work in 30 days. B alone can do it in

A and B together can do a piece of work in 12 days while A alone can d

1.	A and B together can do a piece of work in 12 days while A alone can do the same work in 30 days. B alone can do it in
A.	18 days
B.	20 days
C.	15 days
D.	22 days
Answer» C. 15 days