The "total distance" traveled by a "body in a definite interval of time" is known as "average speed". By derivation it is represented as, Average/ quad speed $=\Big(\frac{\text{Total distance}}{\text{Total timetaken}}\Big)$ Speed is a scalar quantity. So it does not have a unit. the "instantaneous speed" is the "limit of the average speed" as the "duration of the time interval" approaches zero."
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