Final answer:
To determine the car with the fastest average speed, we calculate the average speed for each car and compare the results. Car B has the fastest average speed of 61.2 mph.
Step-by-step explanation:
To determine which car has the fastest average speed, we need to calculate the average speed of each car. Average speed is calculated by dividing the total distance traveled by the time taken. Let's calculate:
Car A: Average speed = 164 miles / 5 hours = 32.8 mph
Car B: Average speed = 306 miles / 5 hours = 61.2 mph
Car C: Average speed = 561 miles / 14 hours = 40.1 mph
Based on these calculations, Car B has the fastest average speed with 61.2 mph.