$A$ can do a piece of work in $30 \text{ days}$ while $B$ can do it in $40 \text{ days}$. $A$ and $B$ working together can do it in (in $\text{days}$)
- A$15 \frac{2}{7}$
- B$17 \frac{1}{7}$
- C$18 \frac{3}{7}$
- DNone of these
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