Consider the flow of an incompressible Newtonian fluid between two parallel plates that are \(4 \mathrm{~mm}\) apart. If the upper plate moves to right with \(u_{1}=5 \mathrm{~m} / \mathrm{s}\) while the bottom one moves to the left with \(u_{2}=1.5 \mathrm{~m} / \mathrm{s}\), what would be the net flow rate at a cross-section between two plates? Take the plate width to be \(5 \mathrm{~cm}\).