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Final Velocity minus Initial Velocity (all together this is the change in velocity) divided by the average acceleration will give you the time it took for the object to reach that speed.(Vf - Vi) / Aaverage = Time
You simply need to divide the distance by the speed. This will give you the AVERAGE speed during the 1.8 seconds in this case.
Calculate the total time, and the total distance. Divide the total distance by the total time. This will give you the average speed.
Slope of the graph will give you speed.
Average speed = distance travelled / time taken > 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)