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- Jan 26, 2012

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**Problem**: The rate that an object cools is directly proportional to the difference between its temperature (in Kelvins) at that time and the surrounding temperature (in Kelvins). If an object is initially at 35 K, and the surrounding temperature remains constant at 10 K, it takes 5 minutes for the object to cool to 25 K. How long will it take for the object to cool to 20 K?

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