An aluminum pan whose thermal conductivity is 237 W/m   °C has a flat bottom with diameter...

An aluminum pan whose thermal conductivity is 237 W/m   °C has a flat bottom with diameter 15 cm and thickness 0.4 cm. Heat is transferred steadily to boiling water in the pan through its bottom at a rate of 800 W. If the inner surface of the bottom of the pan is at 105°C, determine the temperature of the outer surface of the bottom of the pan.