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Mathematics, 30.07.2019 02:20 brainy51
Anew type of pump can drain a certain pool in 4 hours. an older pump can drain the pool in 6 hours. how long will it take both pumps working together to drain the pool? do not do any rounding.
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Anew type of pump can drain a certain pool in 4 hours. an older pump can drain the pool in 6 hours....
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