Two parallel pipelines spaced \(2.0 \mathrm{~m}\) apart are buried in soil having a thermal conductivity of \(0.5 \mathrm{~W} / \mathrm{m} \cdot \mathrm{K}\). The pipes have outer diameters of 300 and \(200 \mathrm{~mm}\) with surface temperatures of \(95^{\circ} \mathrm{C}\) and \(5^{\circ} \mathrm{C}\), respectively. Estimate the heat transfer rate per unit length between the two pipelines.