Question

A and B working together, can do a piece of work in 4(1/2) hours. B and C working together can do it in 3 hours. C and A working together can do it in 2(1/4) 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 hour
E None of these
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