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Mathematics, 05.11.2019 03:31 AshtinDCardwell14

One pump can fill a reservoir in 60 hours. another pump can fill the same reservoir in 80 hours. a third pump 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...
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