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The average speed
If I understand the question correctly.......... Average speed can be calculated by dividing displacement by time (scalar) but once you refer to direction and "velocity" you are into a different paradigm (vector) and it is not as simple as dividing displacement by time
Average speed = distance/time
Average speed may be calculated by dividing the length of the track by the time it takes to complete one circuit.
speed = distance/time = 2.8mi/30min = 0.09mi/min