Add all the speed readings you have, e.g. from every second over a minute. Then you divide the answer by the number of readings you have.
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Speed (in the radial direction) = slope of the graph.
Distance divided by speed will give you the time it took to travel the distance.
Divided the wave's speed by its wavelength.
Average speed.
Average speed during the time = (distance) divided by (time for that distance)