A car moves along an x axis through a distance of 990 m, starting at rest (at x = 0) and ending at rest (at x = 990 m). Through the first 1/4 of that distance, its acceleration is +4.80 m/s. Through the next 3/4 of that distance, its acceleration is -1.60 m/s. What are (a) its travel time through the 990 m and (b) its maximum speed? (a) Number i (b) Number Units Units S m/s