A boat crosses a river with constant velocity with respect to the water, v=0.3 m/s. The boat%u2019s velocity is directed perpendicular to the shores of the river. River width is b=63 m. River flow is not constant and changes across the river as a parabolic function \(u=u_{0}-4(u_{0}/b^{2})(x-(b/2))^{2}\), where x is the distance from the shore and u0 = 5 m/s.
Find the drift s of the boat along the river when it reaches the opposite shore.