Mathematics, 14.07.2020 20:01 Osorio5116

One pump can fill a reservoir in 60 hours. Another pump can fill the same reservoir in 80 hours. a third can empty the reservoir in 90 hours. If all three pumps are operating at the same time, how long will it take to fill the reservoir?

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One pump can fill a reservoir in 60 hours. Another pump can fill the same reservoir in 80 hours. a t...