A and B working together, can do a piece of work in $$ {4{1 over 2}}$$ hours. B and C working together can do it in 3 hours. C and A working together can do it in $$ {2{1 over 4}}$$ hours. All of them 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 $$ {4{1 over 2}}$$

1.	A and B working together, can do a piece of work in $$ {4{1 over 2}}$$ hours. B and C working together can do it in 3 hours. C and A working together can do it in $$ {2{1 over 4}}$$ hours. All of them 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.	1 hours
E.	None of these
Answer» C. 2.5 hours

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A and B working together, can do a piece of work in $$ {4{1 over 2}}$$ hours. B and C working together can do it in 3 hours. C and A working together can do it in $$ {2{1 over 4}}$$ hours. All of them begin the work at the same time. Find how much time they will take to finish the piece of work?

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