Question: At time t = 0, a bottle of juice at 90°F is stood in a mountain stream whose temperature is 50°F. After 5 minutes, its temperature is 80°F. Let H(t) denote the temperature of the juice at time t, in minutes.
(a) Write a differential equation for H(t) using Newton's Law of Cooling.
(b) Solve the differential equation.
(c) When will the temperature of the juice have dropped to 60°F?