4. A pipe of internal diameter 0.2m and wall thickness 0.008m carries steam at 220°C, the thermal conductivity of the material is 12.5 W/mK. Heat is lost from the outside surface by convection to surroundings at 30°C. Determine the outside surface temperature if the convection coefficient has a value of 38.5 W/m2. Also find the heat loss /m length. (1 marks)