A and B can complete a piece of work in 12 and 18 days reapectlvely. A begins to do the work and they work alternatively one at a time for one day each. The whole work will be completed in

A and B can complete a piece of work in 12 and 18 days reapectlvely. A begins to do the work and they work alternatively one at a time for one day each. The whole work will be completed in
1). $14\frac{1}{3}$ days
2). $15\frac{2}{3}$ days
3). $16\frac{1}{3}$ days
4). $18\frac{2}{3}$ days

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