A can do a piece of work in 9 days and B can do the same in 12 days. In how days can the work be completed if A and B work together?

A can do a piece of work in 9 days and B can do the same in 12 days. I

1.	A can do a piece of work in 9 days and B can do the same in 12 days. In how days can the work be completed if A and B work together?
Answer» One day work of A and B`=(1)/(9)+(1)/(12)=(7)/(36)` So they can complete work in `(36)/(7),i.e.,5(1)/(7)`days.

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