Steam flows through the insulated steel pipe shown in cross-section in Figure 5. The pipe and insulation dimensions, their thermal conductivities, and the temperatures and heat transfer coefficients of the steam and the ambient air are marked on the figure. For steady one-dimensional radial conduction, determine (a) the rate of heat loss per metre length of pipe (in W/m) and (b) the temperature of the outer surface of the insulation (in degrees Celsius).