Sally S.

asked • 09/30/14

Rate Problem

One 10-hp pump can fill the backyard pool in 16 hours and a more powerful pump can fill the same pool in 13 hours. The 10-hp pump has been filling the pool for 5 hours before the second more powerful pump is also used to fill the pool. Now the two pumps are working together to fill the pool. What's the total number of hours that the 10-hp pump has spent filling the pool?Don't round your answer.

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