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one pump can empty the pool in 5 days, whereas a second pump can empty the pool in 7 days. how long it will take the two pumps, working together, to empty the pool?
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one pump can empty the pool in 5 days, whereas a second pump can empty the pool in 7 days. how long it will take the two pumps, working together, to empty the pool?

User Pyves
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4 days jfjdhsbsiegebehehebeihrhe
User MS Ibrahim
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