The liquid base of an ice cream has an initial temperature of 90°C before it is placed in a freezer with a constant temperature of -15°C. After 1 hour, the temperature of the ice-cream base has decreased to 60°C. Use Newton's law of cooling to formulate and solve the initial-value problem to determine the temperature of the ice cream 2 hours after it was placed in the freezer. Round your answer to two decimal places.
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