Many of the heat-transfer relations for flow over a flat plate are of the form N u_{x}=\frac{h_{x} x}{k}=C \cdot R e_{x}^{n} \cdot \operatorname{Pr}^{m} \text { Obtain an expression for }

\frac{\overline{\mathrm{h}_{\mathrm{L}}}}{\mathrm{h}_{\mathrm{x}=\mathrm{L}}} \text { in terms of constants. }