Two parallel pipelines spaced 0.5m apart are buried in soil having a thermal conductivity of 0.5 W/(m K). The pipes have outer diameters of 100mm and 75mm with surface temperatures of 175o C and 5o C, respectively. (a) Estimate the heat transfer rate per unit length between the two pipelines. (b) Assuming that that the inside diameter of the smaller-diameter cylinder is 65mm and that the cylinder is made of carbon steel whose thermal conductivity is 50 W/(m K), compute the temperature of the inside surface of the cylinder. (c) If that same cylinder is transporting oil, compute the temperature of the oil if the heat transfer