Mathematics, 26.01.2021 14:00 Travon7956

A small pump can drain a pool in 9 hours. A large pump could drain the same pool in 3 hours. How long (to the nearest minute) will it take to drain the pool if both pumps are used simultaneously?

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A small pump can drain a pool in 9 hours. A large pump could drain the same pool in 3 hours. How lon...