Speed describes the distance traveled for each one unit of time, so a ratio such as 120 miles in 3 hours represents a unit rate of 40 miles per hour. Tables, double number lines, and coordinate graphs can show equivalent distance–time relationships and support comparisons, while emphasizing that greater distance does not necessarily mean greater speed unless the time is also considered. This scope treats speed as a constant or overall rate and excludes instantaneous speed, velocity, and acceleration.
Speed tells how much distance is traveled in 1 unit of time. To find speed, divide:
The answer should include units, such as miles per hour.
Example:
Car A travels miles in hours. Car B travels miles in hours. Which car is faster?
Step 1: Find Car A’s speed.
Car A travels miles for every hour.
Step 2: Find Car B’s speed.
Car B travels miles for every hour.
Step 3: Compare the unit rates.
So, Car A is faster.
Notice that Car B traveled a greater total distance, but it took more time. To compare speed fairly, compare the distance traveled for 1 hour, not just the total distance.
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