$($c$).$ Engine oil at $80C$ flows over a flat surface at $40C$ for cooling purpose, the flow velocity being $2\frac{m}{s}.$ Determine at a distance of $0\mathrm{.}4$ m from the leading edge the hydrodynamic and thermal boundary layer thickness. Also determine the local and average valuesovalues of friction and convection coefficients. given that:kine kinetic viscosity$=83\backslash$times $10$ raised to power $-6$m$,$ pr$=10\mathrm{.}5,$ k$=01407$W$/$mk