A plane wall 6.0 cm thick generates heat internally at the rate of 0.3 MW/m³. One side of the wall is insulated, and the other side is exposed to an environment at 93ºC. The convection heat-transfer coefficient between the wall and the environment is 570 W/m² · ºC. The thermal conductivity of the wall is 21 W/m · ºC. Calculate the maximum temperature in the wall.