A can do one and a half as much of a work which B can do in one day. B alone can do a piece of work in 18 days. They together can finish that work in

A can do one and a half as much of a work which B can do in one day. B alone can do a piece of work in 18 days. They together can finish that work in
1). $10\frac{1}{5}$ days
2). $11\frac{1}{5}$ days
3). $5\frac{1}{5}$ days
4). $7\frac{1}{5}$ days

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