Which equation correctly represents speed as distance divided by time?

• A. Speed = Distance / Time
• B. Time = Distance / Speed
• C. Distance = Time / Speed
• D. Distance = Speed × Time

Answer: (A)

Speed tells us how far something travels in a given amount of time, so it is found by dividing distance by time. The equation speed = distance / time directly shows that idea: you take the distance traveled and divide it by the time taken to get the speed. For example, traveling 100 meters in 20 seconds gives a speed of 100/20 = 5 m/s. The other forms describe related relationships but don’t express speed in the form distance divided by time: time = distance / speed solves for time, distance = time / speed would mix units in an incorrect way for distance, and distance = speed × time is another valid relation that expresses distance, but not speed as distance divided by time.