A car traveling on the taconic parkway travels 84 miles in two hours. what is cars speed (a special type of rate) in miles per hour?

Speed is the magnitude in a velocity. It is a scalar quantity so it does not have direction unlike velocity which is a vector quantity. Speed and velocity refers to the distance traveled by a moving object per unit of time. We calculate speed as follows:

Speed = distance / time = 84 miles / 2 hours

Speed = 42 miles per hour