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The unit for a rate is the unit for the numerator divided by the unit for the denominator. For example, speed = distance divided by time. If distance is measured in micrometres and time in hours, then the units for speed are micrometres per hour.
Rates are ratios ... Speed is a rate of distance per unit of time... ratio of distance to time. Proportions are two equal ratios, whether they are rates or not.
it mean per rate
displacement or distance.
to find the speed at which you are traveling