Mathematics, 20.08.2019 09:50, dee6991

It takes 120 minutes for a hose to fill a swimming pool. if the pool drain is open, it takes 360 minutes to fill the pool. if the pool is full, the hose is off, and drain is open, how many minutes does it take to empty the pool?

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It takes 120 minutes for a hose to fill a swimming pool. if the pool drain is open, it takes 360 min...