Answer:
Therefore, the average speed of the car over the entire duration is 300 miles / 6 hours = 50 miles per hour. Answer: \boxed{50}.
Explanation:
To find the average speed, we need to calculate the total distance traveled and divide it by the total time taken.
The total distance traveled is 135 miles + 165 miles = 300 miles.
The time taken for the first part of the journey is 135 miles / 45 mph = 3 hours.
The time taken for the second part of the journey is 165 miles / 55 mph = 3 hours.
Thus, the total time taken is 3 hours + 3 hours = 6 hours.
Therefore, the average speed of the car over the entire duration is 300 miles / 6 hours = 50 miles per hour. Answer: \boxed{50}.
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