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Mathematics, 22.01.2021 20:00 sherylpoche23
One day, the system stops working correctly. The faucet starts to fill the aquarium at a rate of 30 liters per minute, and the drain opens at the same time, draining the water at a rate of 20 liters per minute.
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One day, the system stops working correctly. The faucet starts to fill the aquarium at a rate of 30...
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