Mathematics, 15.11.2020 19:00, nssjdjsididiodododod

The cold water faucet of a bathtub can fill the tub in 15 minutes. The drain, when opened, can empty the full tub in 20 minutes. Suppose the tub is empty and the faucet and drain are both opened at the same time. How long will it take to fill the tub?

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The cold water faucet of a bathtub can fill the tub in 15 minutes. The drain, when opened, can empty...