A can do $\frac{7}{8}$ of work in 28 days, 8 can do $\frac{5}{6}$ of the same work in 20 days they will take to complete if they do it together is

A can do $\frac{7}{8}$ of work in 28 days, 8 can do $\frac{5}{6}$ of the same work in 20 days they will take to complete if they do it together is
1). $15\frac{3}{7}$ days
2). $17\frac{3}{5}$ days
3). $14\frac{5}{7}$ days
4). $13\frac{5}{7}$ days

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