A biology labs walk-in cooler measures 30 m by 20 m by 23 m, Ask an Expert

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A biology lab's walk-in cooler measures 3.0 m by 2.0 m by 2.3 m and is insulated with 8.0-cm-thick Styrofoam. If the surrounding building is at 20 degrees celcius, at what average rate must the cooler's refrigeration unit remove heat in order to maintain 4.0 degrees celcius in the cooler?

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