Asked by John Ng

A dish of ice cream is left on the table in a room with a constant temperature of 70ºF. At t = 0, the temperature of the ice cream is 20ºF. Five minutes later, its temperature is 25ºF. When will it melt? (The ice cream will melt at 35ºF.)

15 minutes

16.93 minutes

11.477 minutes

47.456 minutes

There's not enough information to tell.
Answered by oobleck
You have Newton's cooling formula. Plug in your data points (T(0)=20, T(5)=25) to get the constants involved. Then find when T(x) = 35.
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