A can do a certain work in the same time in which B and C together can do it. If A and B together could do it in 10 days and C alone in 50 days, then B alone could do it in:

A can do a certain work in the same time in which B and C together can

1.	A can do a certain work in the same time in which B and C together can do it. If A and B together could do it in 10 days and C alone in 50 days, then B alone could do it in:
A.	15 days
B.	20 days
C.	25 days
D.	0 days
Answer» B. 20 days