In a flat wall with a thickness of 20 mm (17 W/mK), a heat flow of 90 MW/m3 is released per unit volume. The temperatures on the boundary surfaces of the wall have constant values, namely T=1500 C and T=2000 C. Determine: the distance X measured from the edge of the surface with temperature T to the plane in the wall with the maximum temperature value, the expression for the temperature field in the wall and the maximum temperature value in the wall.