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A mug of coffee, with a temperature ?℃ is made and left to cool in a...

A mug of coffee, with a temperature ?℃ is made and left to cool in a room with a temperature of 25℃. The rate at which the coffee cools is proportional to the difference in temperature between the coffee and the room. Initially the coffee is at a temperature 85℃. 10 minutes later the coffee is at 55℃. Determine the temperature, to 1 decimal place, of the coffee after 15 minutes.

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