It is desired to transport liquid metal through a pipe embedded in a wall at a point where the temperature is 650 K. A 1.2-m-thick wall constructed of a material having a thermal conductivity varying with temperature according to k = 0.0073 (1 + 0.0054T), where T is in K and k is in W/m · K, has its inside surface maintained at 925 K. The outside surface is exposed to air at 300 K with a convective heat-transfer coefficient of 23W/ m² · K. How far from the hot surface should the pipe be located? What is the heat flux for the wall?