potato

[logistic_guy]

A potato is taken from the oven, its temperature having reached \(\displaystyle 350\) degrees. After sitting on a plate in a \(\displaystyle 70\)-degree room for twelve minutes, its temperature has dropped to \(\displaystyle 250\) degrees. In how many more minutes will the potato's temperature reach \(\displaystyle 120\) degrees? Assume Newton's Law of Cooling, which says that the difference between an object's temperature and the ambient temperature is an exponential function of time.