need answers a,b, and c.

The graph shows the position s = f(t) of a car t hours after 5:00 P.M. relative to its starting point s = 0, where's is measured in miles. 200- (a) Describe the velocity of the car. Specifically, when is it speeding up and when is it slowing down? (b) At approximately what time is the car traveling the fastest? The slowest? (c) What is the approximate maximum velocity of the car? The approximate minimum velocity? (a) When is the car speeding up? (Simplify your answer. Type your answer in interval notation. Round to the nearest grid line as needed. Use a comma to separate answers as needed.)