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At 10.00 A.M. a woman took a cup of hot ...

At 10.00 A.M. a woman took a cup of hot instant coffe from her microwave oven and placed it on a nearby Kitchen counter to cool. At this instant the temperature of the coffee was `180^(@)F`, and 10 minutes later it was `160^(@)F`. Assume that constant temperature of the kitchen was `70^(@)F`.
The woman likes to drink coffe when its temperature is between `130^(@)F` and `140^(@)F`. between what time should she have drunk the coffee?

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The correct Answer is:
t=22.6 min
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