Problem 3: Newton's Law of Cooling states that the rate of change of the temperature of an object is proportional to the difference between the object's current temperature and that of its surrounding medium. Let y represent the temperature (in °F) of an object in a room whose temperature is kept at a constant 60°F. The object cools from 100°F to 90°F in 10 minutes. How much longer will it take for the temperature of the object to decrease to 80°F?
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