# Time and Work - 03

## 09. If m men can do a work in r days, then the number of days taken by (m + n) men to do it is :

• 1
$\frac{\text{m}+\text{n}}{\text{mn}}$
• 2
$\frac{\text{m}+\text{n}}{\text{mr}}$
• 3
$\frac{\text{mr}}{\text{m}+\text{n}}$
• 4
$\frac{\text{r}\left(\text{m}+\text{n}\right)}{\text{mn}}$
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