A and B can do a piece of work in 6 days and A alone can

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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 ?

1. 18 days
2. 15 days
3. 12 days
4. 7¹/₂

Correct Option: A

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