# pumps

## Using two pumps

Submitted by ramelcoletana on February 28, 2021 - 1:06pm

An 8-horsepower (hp) pump can fill a

tank in 8 hours. A smaller, 3-hp pump fills the same tank in

12 hours. The pumps are used together to begin filling this

tank. After four hours, the 8-hp pump breaks down. How

long will it take the smaller pump to fill the tank?