A can do a piece of work in 20 days and B can do the same piece of work in 30 days. Find in how many days both can do the work?

A can do a piece of work in 20 days and B can do the same piece of wor

1.	A can do a piece of work in 20 days and B can do the same piece of work in 30 days. Find in how many days both can do the work?
A.	28
B.	20
C.	34
D.	12
Answer» E.

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