A and B can complete a work in 12 days a...

A and B can complete a work in 12 days and 18 days, respectively. A begins to do the work and they work alternately one at a time for 1 day each. The whole work will be completed in how many days?

`14 (2)/(3)`

`14(1)/(3)`

`14 (2)/(5)`

`14 (5)/(7)`

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