Four race cars are traveling on a 2.5 mile tri-oval track at constant speeds of 195 mph, 190 mph, 185 mph and 180 mph. Assuming you are an observer standing at a point of the track for a period of 30 minutes and are recording the instantaneous speed for each vehicle as it crosses your point. What is the time mean speed and space mean speed for these vehicles for this time period (Hint: Be careful with rounding).