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**1. Homework Statement**

A househusband is cooking beef stew for his family in a pan that is (a) uncovered, (b) covered with a light lid, and (c) covered with a heavy lid. For which case will the cooking be the shortest? Why?

**2. Homework Equations**

**3. The Attempt at a Solution**

I dont know where to start with this question. Any help would be appreciated. thanks.