A and B together can do a work In 4 days. A alone can do it in 12days.what time B will take to do the work alone?

 A and B together can do a work In 4 days. A alone can do it in 12days.what time B will take to do the work alone?

A).

6 days

B). 8 days

C). 12 days

D). 10 days

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