Determine the temperafure distribution along the length of the \( \operatorname{rod}(a+L / 4, L / 2,3 L / 4 \) are \( L) \) as shown in figuse the rod with radius of \( 25 \mathrm{~mm} \) is insulated at the perimetor. The left end has a constant temper- athre of \( 40^{\circ} \mathrm{C} \) and a free stream temperature \( T_{\infty} \) is \( -10^{\circ} \mathrm{C} \), let \( k_{x x}=35 \mathrm{~W} / \mathrm{m}^{\circ} \mathrm{C} \) and \( h=55 \mathrm{w} / \mathrm{m}^{2} \mathrm{C} \)