C alone can complete a work in 20 days and D alone can complete the same work in 30 days. In how many days C and D together can complete the same work?

C alone can complete a work in 20 days and D alone can complete the sa

1.	C alone can complete a work in 20 days and D alone can complete the same work in 30 days. In how many days C and D together can complete the same work?
A.	6 days
B.	12 days
C.	15 days
D.	8 days
Answer» C. 15 days

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C alone can complete a work in 20 days and D alone can complete the same work in 30 days. In how many days C and D together can complete the same work?

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