A. Assume that a person takes an automobile trip and that distance travelled s can be estimated as a function of time expressed by the nonlinear function s = f(t) = 35t3 - 14t2 + 6t where s is measured in miles, t is measured in hours and 0 t 12. During this 12-hour journey the speed of the car may change continuously (e.g., because of traffic lights, rest stops, etc.). Find the average speed of the car.