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Hydrochloric acid (HCl) is fed to a tank with 3 m 3 volume at a rate of 4 kg/s and it is withdrawnat a rate

Hydrochloric acid (HCl) is fed to a tank with 3 m3 volume at a rate of 4 kg/s and it is withdrawnat a rate of 6 kg/s. 2/3 of the tank is initially filled with HCl. How long will it take to empty the tank?

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