A can do $\frac{1}{6}$ of a work in 5 days and B can do $\frac{2}{5}$ of the work in 8 days, in how many days, can both A and B together do the work ?

A can do $\frac{1}{6}$ of a work in 5 days and B can do $\frac{2}{5}$ of the work in 8 days, in how many days, can both A and B together do the work ?
1). 12 days
2). 13 days
3). 15 days
4). 20 days

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