# Jack usually mows his lawn in 5 hours. Marilyn can mow the same yard in 7 hours. How much time would it take for them to mow the lawn together?

##### 1 Answer

Jun 21, 2018

#### Explanation:

If Jack can mow his lawn in

Similarly, Marilyn can mow

So, together, they can mow

This means that after

We want to know how many hours it takes them to mow one lawn, so we want to solve

and thus

And