It is the instantaneous speed of the bike rider.
Explanation:
At the mile marker, the measured speed gives the instantaneous speed of the bike rider.
The instantaneous speed is speed measured at a precise or instance of time.
Speed is the rate of change of distance with time. It is a scalar quantity that only shows magnitude with no reference to direction.
Velocity is the displacement divided by time. It has both magnitude and directions.
Average speed is measured over a period of time as the distance increases from the starting point.
From this, we can see that 13.5mph is the instantaneous speed of the bike rider.
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Instantaneous velocity brainly.com/question/2234298
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