The magnitude of axial velocity (in m/s) at a radial location of 0.2 cm is __

Question

For a fully developed laminar flow of water (dynamic viscosity 0.001 Pa-s) through a pipe of radius 5 cm, the axial pressure gradient is –10 Pa/m The magnitude of axial velocity (in m/s) at a radial location of 0.2 cm is __