Average speed = distance travelled / time taken
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125 mile journey takes 1.5 hours, then 125 / 1.5 = 83.33 mph average speed for the journey.
GPS speedos appear to give instant speed reading, but use the same equation except over a very short distance (say 10 metres)
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About 55 miles per hour.
24.85 miles per hour
It is81.25 miles per hour
The speed is 559.234073013601 miles per hour
127.38109440865345 Miles per Hour