A can do piece of work in 30 days while B can do it in 40 days. In how many days can A and B working together do it ?

A can do piece of work in 30 days while B can do it in 40 days. In how

1.	A can do piece of work in 30 days while B can do it in 40 days. In how many days can A and B working together do it ?
A.	70 days
B.	120/7 days
C.	50 days
D.	45 days
Answer» C. 50 days

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A can do piece of work in 30 days while B can do it in 40 days. In how many days can A and B working together do it ?

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