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Mathematics, 08.07.2019 20:30 Elency
Apond is being drained by a pump. after 3 hours, the pond is half empty. a second pump is put into operation and together the two pumps finish emptying the pond in half an hour. how long would it take the second pump to drain the pond if it had to do the same job alone?
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Apond is being drained by a pump. after 3 hours, the pond is half empty. a second pump is put into o...
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