Rate. The official equation is r=d/t, or rate=distance divided by time.
Example:
A train is traveling about 450 miles to Spain. It gets there in 5 hours.
Set up your equation:
r=d/t
r=450/5
r=90 which means that the train was traveling at a rate/speed of 90 miles per hour. If you are unsure of the answer just plug it in and check it.
90=450/5
90=90 True
Now you have verified your equation, and the answer is that the train was traveling 90 mph.
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Distance divided by time is the formula for speed. Distance = speed by time also
Speed or velocity can be expressed as the distance divided by time.
Time = (distance) divided by (speed) Distance = (speed) multiplied by (time) Speed = (distance) divided by (time)
The definition of speed is the size/magnitude/measure of an object's velocity. Average speed = distance divided by time
Speed = distance divided by time