The free stream velocity of the flow is $70\,m/s$.  Bernaulli’s equation relates pressure and velocity of a fluid motion along a streamline. $$p + \frac{1}{2}\rho {v^2} = \mathrm{Constant}$$ Therefore, $${p_\infty } + \frac{1}{2}\rho v_\infty ^2 = p + \frac{1}{2}\rho {v^2}$$ At sea level conditions, freestream pressure and density are ${{\rm{\rho }}_\infty }{\rm{ = 1}}{\rm{.23kg/}}{{\rm{m}}^{\rm{3}}}$ and  ${p_\infty }{\rm{ = 1}}{\rm{.01}} \times {\rm{1}}{{\rm{0}}^5}{\rm{N/}}{{\rm{m}}^{\rm{2}}}$. Velocity at the given point will be $$v = \sqrt {\frac{{2\left( {{p_\infty } – p} \right)}}{\rho } + v_\infty ^2}$$ Substituting the values $$v = \sqrt {\frac{{2\left( {1.01 – 0.4} \right) \times {{10}^5}}}{{1.23}} + {{\left( {70} \right)}^2}}$$ $$\Rightarrow v = 322.63\,{\rm{m/s}}{\rm{.}}$$