A pot with a steel bottom 1.2cm thick rests on a hot stove. The area of the bottom of the pot is 0.150m2. The water inside the pot is at 100∘C, and 0.440kg evaporates every 5.0min. Find the temperature of the lower surface of the pot, which is in contact with the stove. Take Lv=2.256×106J/kg and ksteel=50.2W/(mK).