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No, speed can vary and one can still calculate the average speed of an entire trip. Average speed is equal to the change in distance divided by the change in time.
If you divide the distance of your trip by the total time it took to make the trip, you calculate the average speed. That includes all the time you're stuck in traffic, gassing the car, and stopping to eat.
The average speed for the entire trip is 9mph.
(300+k)/96*60
The answer is