3) The east wall of an electrically heated home is 25ft long, 11ft high, and 1ft thick, and is made of concrete whose thermal conductivity is k=0.6Btu/h.ftF. On a certain autumn night, both the temperatures of the inner and outer surfaces of the wall are approximately 65F and 35F, respectively, for a period of 12h. Determine the rate heat loss through the wall that night