A and B together can do a work in 6 days. If A alone can do the work in 10 days then in how many days can B alone do it ?

 A and B together can do a work in 6 days. If A alone can do the work in 10 days then in how many days can B alone do it ?

A). 7 days

B). 10 days

C). 15 days

D). 19 days

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