A can do a piece of work in 4 hours, B and C together in 3 hours, and A and C together in 2 hours. How long will B alone take to do it ?

A can do a piece of work in 4 hours, B and C together in 3 hours, and

1.	A can do a piece of work in 4 hours, B and C together in 3 hours, and A and C together in 2 hours. How long will B alone take to do it ?
A.	hours
B.	0 hours
C.	2 hours
D.	4 hours
Answer» D. 4 hours