A can complete a piece of work alone in x days but B takes (2x – 4) days to complete the same piece of work. If the efficiency of B is 40% less than that of A, then in how many days A and B together can complete the piece of work?

A can complete a piece of work alone in x days but B takes (2x – 4)

1.	A can complete a piece of work alone in x days but B takes (2x – 4) days to complete the same piece of work. If the efficiency of B is 40% less than that of A, then in how many days A and B together can complete the piece of work?
A.	6 days
B.	8 days
C.	7.5 days
D.	12.5 days
E.	None of these
Answer» D. 12.5 days

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A can complete a piece of work alone in x days but B takes (2x – 4) days to complete the same piece of work. If the efficiency of B is 40% less than that of A, then in how many days A and B together can complete the piece of work?

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