SOLUTION: A 5-horsepower (hp) pump can empty a pool in 5 hours. A smaller, 2-hp pump empties the same pool in 8 hours. The pumps are used together to start emptying the pool. After three hou

Question 53079: A 5-horsepower (hp) pump can empty a pool in 5 hours. A smaller, 2-hp pump empties the same pool in 8 hours. The pumps are used together to start emptying the pool. After three hours, the 2-hp pump breaks down. How much longer will it take the larger pump to finish emptying the pool, in hours and minutes?
Answer by Paul(988) (Show Source): You can put this solution on YOUR website!
Together:

3 HOurs:
--> so there is left:
EQUATION:

Solve and u get x=0.125 or 0.125(60)=7.5 minutes.
Paul.
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