A and B can separately do a piece of work in 9 days and 18 days respectively. How long will they together take to do the work?

A and B can separately do a piece of work in 9 days and 18 days respec

1.	A and B can separately do a piece of work in 9 days and 18 days respectively. How long will they together take to do the work?
A.	9 days
B.	18 days
C.	10 days
D.	6 days
Answer» E.

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A and B can separately do a piece of work in 9 days and 18 days respectively. How long will they together take to do the work?

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