A and B working together; can do a piece of work in 4 1hours. B and C working together 2 can do it in 3 hours. C and A working together can do it in 21hours. All of them4 begin the work at the same time. Find how much time they will take to finish the piece of work.

A and B working together; can do a piece of work in 4 1hours. B and C

1.	A and B working together; can do a piece of work in 4 1hours. B and C working together 2 can do it in 3 hours. C and A working together can do it in 21hours. All of them4 begin the work at the same time. Find how much time they will take to finish the piece of work.
A.	3 hours
B.	2 hours
C.	2 5 hours
D.	3 25 hours
Answer» C. 2 5 hours

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A and B working together; can do a piece of work in 4 1hours. B and C working together 2 can do it in 3 hours. C and A working together can do it in 21hours. All of them4 begin the work at the same time. Find how much time they will take to finish the piece of work.

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