To warm up a glass of milk initially at 3 C, a mother places the glass in a large pan filled up with water at 70 C. The glass is thin-walled, d=6 cm. The height of the milk in the glass is H=7 cm. Assume that the milk is stirred often enough so that its temperature is nearly uniform. The heat transfer coefficient between the milk and the glass is h=120 W/m2-K. Determine the time needed to warm up the milk from 3 C to 38 C