A mild steel tank of wall thickness 12 mm contains water at $$100^\circ C$$. The atmospheric temperature is $$20^\circ C$$. The thermal conductivity of mild steel is $$50 W/mK$$, and the heat transfer co-efficients for inside and outside the tank are 2850 and $$10 W/m^2 K$$, respectively. Calculate the rate of heat loss per $$m^2$$ of tank surface and the temperature of the outside surface of the tank.