A can do a certain work in 15 days, while Working together, A and B can do the same work in 7.5 days. How many days will B alone take to do the same work?

A can do a certain work in 15 days, while Working together, A and B ca

1.	A can do a certain work in 15 days, while Working together, A and B can do the same work in 7.5 days. How many days will B alone take to do the same work?
A.	15 days
B.	12.5 days
C.	17.5 days
D.	20 days
Answer» B. 12.5 days

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A can do a certain work in 15 days, while Working together, A and B can do the same work in 7.5 days. How many days will B alone take to do the same work?

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