The velocity profile for a fully developed laminar flow of an incompressible Newtonian fluid, at steady state, through a horizontal infinitely wide and long slit of gap 0.01 m is given by the following equation.
\[ u(y) = 7.5 - 3\times10^{5}y^2 \]
where \(y\) is the vertical distance measured from the center of the slit. The average velocity of the fluid (in m s-1) is ______ (rounded off to the nearest integer).