Suppose that a = 0.5 mi, u0 = 9 mi/h, and us= 3 mi/h as in Example 4, but that the velocit...

Suppose that a = 0.5 mi, u0 = 9 mi/h, and us= 3 mi/h as in Example 4, but that the velocity of the river is given by the fourth-degree function

rather than the quadratic function in. Now find how far downstream the swimmer drifts as he crosses the river.