A steel pipe with 5-cm is covered with a 6.4-mm asbestos insulation [k =0.166 W/m °C] followed by a 2.5-cm layer of fiberglass insulation [k=0.0485 W/m °C]. The pipe-wall temperature is 315°C, and the outside insulation temperature is 38 °C. Calculate the interface temperature between the asbestos and fiberglass. [286.7 °C]