Question: When will a tank fill? A large rectangular tank is being simultaneously filled and drained at constant flow rates of 20 gallons per minute and

When will a tank fill? A large rectangular tank is being simultaneously filled and drained at constant flow rates of 20 gallons per minute and 15 gallons per minute, respectively. The tank has a maximum depth of 4 feet and a planar area of 30 square feet. If the tank is initially empty, how long will it take to fill the tank? Report your answer in minutes.

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