A can do a work in 20 days. He works alone for 5 days and then B finishes the remaining work in 9 days. In how many days can B alone complete the whole work?

Question

Accepted Answer

12. In 5 days A does 5/20 = 1/4 of the work; B does the remaining 3/4 in 9 days, so B's rate = (3/4)/9 = 1/12 per day, i.e. 12 days for the whole work.

A can do a work in 20 days. He works alone for 5 days and then B finishes the remaining work in 9 days. In how many days can B alone complete the whole work?

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