A 5 horsepower (hp) pump can empty a pool in 5 hours. A smaller, 2hp pump empties the same pool in 8 hours. The pumps are used together to begin emptying this pool. After 2 hours, the 2hp pump breaks down. How long will it take the larger pump to empty the pool?
(1) Is this question similar to math questions about working alone and working together?
(2) How do you set up an equation for such a question?
I got lost when the 2hp pump broke down after 2 hours.