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

1.	A can do a piece of work in 4 hours; B and C together can do it in 3 hours, while A and C together can do it 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