Average Speed of a Highway Vehicle The average speed of a vehicle on a stretch of Route 134 between 6 A.M. and 10 A.M. on a typical weekday is approximated by the function
where f (t) is measured in miles per hour and t is measured in hours, with t = 0 corresponding to 6 A.M.
(a) Compute f'(t)
(b) What is the average speed of a vehicle on that stretch of route 134 at 6:00 AM? 7:00 AM? 8:00 AM?
(c) How fast is the average speed of a vehicle on that stretch of route 134 changing at 6:30 AM? 7:00 AM? 8:00 AM?