A and B together can do a piece of work in 5 days and A alone can do it in 8 days, then B alone can do the same piece of work in :
[A] 16\tfrac{4}{5}days
[B] 13\tfrac{1}{3}days
[C] 12\tfrac{3}{5}days
[D] 11\tfrac{1}{3}days

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