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A and B can do a piece of work in 6 days and A alone can do it in 9 days. The time taken by B alone to do the same work is?

18 days
15 days
12 days
71/2

Correct Answer: 18 days

Explanation:

B's one day's work = (1/6 - 1/9) = 1/18
∴ B alone can finish it in 18 days.

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