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suppose that a small pump can empty a swimming pool in 60 hours and that a large pump can empty a pool in 40 hours. working together, how long will it take to empty the pool?
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suppose that a small pump can empty a swimming pool in 60 hours and that a large pump can empty a pool in 40 hours. working together, how long will it take to empty the pool?

User Christoph Hummler
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I would assume that you would subtract 40 from 60 and get 20. (60-40=20) So I'd say 20 hours.
User Dhythhsba
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