# Working alone, it takes Maria nine hours to dig a 10 ft by 10 ft hole. Darryl can dig the same hole in ten hours. How long would it take them if they worked together?

##### 1 Answer

Jul 4, 2018

#### Explanation:

Maria alone takes

Darryl alone takes

Now, the fraction of work done in one hour by Maria & Darryl working together

If takes total