How long will it take coffee to cool to given fahrenheit


A cup of coffee is poured at 190·Fahrenheit, and is permitted to cool in the 70`Fahrenheit room. If temperature of coffee is 170`Fahrenheit after half an hour.

a. Find temperature be after 70 minutes?

b. How long will it take coffee to cool to 120`Fahrenheit?

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Mathematics: How long will it take coffee to cool to given fahrenheit
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