Consider a 1.2 m high, 2 m wide glass window, 6 mm thick, k = 0.78 W/m·°C. Room 24 °C, outdoors −5 °C; h_{1} = 10, h_{2} = 25 W/m^{2}·°C; neglect radiation. Determine (a) the heat transfer rate (answer in W) and (b) the inner surface temperature (answer in °C).