Two persons A and B working together can complete a piece of work in 15 days but a third person C can destroy half the completed work in 15 days. In how many days A, B, and C working together can complete one fourth of the piece of work?

Two persons A and B working together can complete a piece of work in 1

1.	Two persons A and B working together can complete a piece of work in 15 days but a third person C can destroy half the completed work in 15 days. In how many days A, B, and C working together can complete one fourth of the piece of work?
A.	8.5 days
B.	12.5 days
C.	10 days
D.	7.5 days
E.	None of these
Answer» E. None of these

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Two persons A and B working together can complete a piece of work in 15 days but a third person C can destroy half the completed work in 15 days. In how many days A, B, and C working together can complete one fourth of the piece of work?

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