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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`.
(i) What was the temperature of the coffee at 10.15 A.M. ?

Text Solution

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The correct Answer is:
The temperature of the coffe at 10.15 am is 151.3F
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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?