That depends on that data you have.
If you have a start and finish time, and the overall distance then you divide the distance in miles (or other units) by the number of hours and you'll get miles per hour.
If I leave home at 07:15 and get to work at 9:00, having travelled 6.5 miles then I have an average speed of 6.5 / 1.75 = 3.71 mph. (but that's enough about the Dublin bus service!)If you have two or more different speeds, and the length of time each was travelled then you wan work out the overall distance and the overall time, and proceed as above.
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Speed is distance divided by time so pick the section you want to work out the average for, work out how much distance has been traveled in that section and divide it by how much time has passed for that section.
For the instantaneous value of average velocity, average speed and average velocity are equal.
Distance = time * average speed (velocity) Average speed = Distance/time
40 MPH is the average speed
Average speed = Distance/Time Average speed = 5400/9 = 600 mph