Mathematics, 23.12.2019 05:31 saraderrico

Asmall pump can drain a pool in 7 hours. a large pump could drain the same pool in 2 hours. how long will it take to drain the pool of both pumps are used simultaneously

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Asmall pump can drain a pool in 7 hours. a large pump could drain the same pool in 2 hours. how long...

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