please answer this question sir or mam

8. A high temperature reactor is insulted with a layer of firebrick followed by another layer of insulation making an overall insulation of 350 mm. The reactor wall-firebrick interface temperature is 1623 K. If the maximum operating temperature of fire brick-insulation interface 1473 K, calculate (a) the thickness of refractory brick and insulation thickness (b) the surface temperature of insulation. I Data: Thermal conductivity of fire brick is 0.85 W/mK, Thermal conductivity of insulation is 0.15 W/mK, Heat transfer coeffient from insulation surface to ambient air is 10 W/m2K and Ambient temperature 293 K. ET