A man and a woman can do a work together in 12 days. Their efficiencies are in the ratio 2 ∶ 3. Working alone, in how many days can the woman complete the work?

A man and a woman can do a work together in 12 days. Their efficiencie

1.	A man and a woman can do a work together in 12 days. Their efficiencies are in the ratio 2 ∶ 3. Working alone, in how many days can the woman complete the work?
A.	10
B.	15
C.	30
D.	20
Answer» E.

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A man and a woman can do a work together in 12 days. Their efficiencies are in the ratio 2 ∶ 3. Working alone, in how many days can the woman complete the work?

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