A shaft section consists of a hollow rectangular section and a solid rectangular section as shown in the figure. Composite shaft is subjected to a twisting moment of $100$ Nm $.$ Determine $($i$)$ torque shared by hollow and solid section, $($ii$)$ maximum shear stress developed in both the sections, $($iii$)$ angular twist per meter length in shaft if G $\backslash (=25\backslash$times $10^\{3\}\backslash )\backslash (\backslash$mathrm$\{$N$\}/\backslash$mathrm$\{$mm$\}^\{2\}\backslash ).$