A and B together can do a piece of work in 5 days and A alone can do it ih 8 days, B alone can do the same piece of work in

A and B together can do a piece of work in 5 days and A alone can do it ih 8 days, B alone can do the same piece of work in
1). $11\frac{1}{3}$ days
2). $12\frac{3}{5}$ days
3). $13\frac{1}{3}$ days
4). $16\frac{4}{5}$ days

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