Speed Speed is the measurement of how fast an object is moving. The speed is the rate of change of distance with time, or how far does an object move in an interval of time.
Speed has the units of distance per time interval.
An ambulance is located 15 km from the hospital. The distance between Washington and Baltimore is 90 km. B. Distance need not be measured in the common units of meters or kilometers. It could be in angular measure such as degrees. Then speed has the units of angular distance per time interval.