A thin layer of liquid, draining from an inclined plane, as in Fig. P3.26, will have a laminar velocity profile u≈U0(2y/h−y2/h2), where U0 is the surface velocity. If the plane has width b into the paper, determine the volume rate of flow in the film. Suppose that h=0.5 in and the flow rate per foot of channel width is 1.25 gal/min. Estimate U0 in ft/s.