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An hour is a unit of time. A mile is a unit of distance. Without some unit of speed to compare, the two units are incompatible.
Generally: RATE = DISTANCE / TIME -or- DISTANCE = RATE * TIME -or- TIME = DISTANCE / RATE qed
Distance = Rate x Time Rate = Distance/Time, not Time/Distance
Average speed during the time = (distance) divided by (time for that distance)
When looking at a distance vs. time graph, it shows how far an object is traveling over a certain amount of time which can be written like this: distance per time or distance/time (distance divided by time) If we then put units in for distance (let's say meters) and time (seconds) we get this: meters/seconds which is the same as the units for speed.