Mathematics, 25.09.2019 07:20 batmanmarie2004

Asmall pump can drain a pool in 9 hours. a large pump could drain the same pool in 7 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 9 hours. a large pump could drain the same pool in 7 hours. how long...