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The rate of change of the temperature of an object is proportional to the difference between...

The rate of change of the temperature of an object is proportional to the difference between the temperature of the object and the temperature of the environment (Newton's Law). In addition, heat flows from the warm to the cold.

Water is boiled in a saucepan and then removed from the heating element, so that the initial temperature of the water is 100 degrees Celsius, while the temperature of the room is 20 degrees Celsius and will be assumed to be constant.

Knowing that 5 minutes later the water temperature is 60 degrees Celsius, how much more time will it take for the water temperature to reach 25 degrees Celsius?
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