Problem 264 of 333EasyCalculusP264

Cooling coffee

A cup of coffee at $90^\circ$ C sits in a $20^\circ$ C room. After 10 minutes it is at $60^\circ$ C. Assume Newton's law of cooling: the gap between the coffee and the room shrinks at a rate proportional to the gap. When does the coffee reach $40^\circ$ C?
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