A can do a piece of work in 14 days while B can do it in 21 days. In how many days, working together they will complete the whole work?

A can do a piece of work in 14 days while B can do it in 21 days. In h

1.	A can do a piece of work in 14 days while B can do it in 21 days. In how many days, working together they will complete the whole work?
A.	10.5
B.	8
C.	8.4
D.	9
Answer» D. 9

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A can do a piece of work in 14 days while B can do it in 21 days. In how many days, working together they will complete the whole work?

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