Saturated steam at \(55^{\circ} \mathrm{C}\) is to be condensed at a rate of \(10 \mathrm{~kg} / \mathrm{h}\) on the outside of a vertical tube of diameter \(3 \mathrm{~cm}\) by maintaining the surface at \(45^{\circ} \mathrm{C}\). Find the tube length required for this purpose.