1. Calculating Average Speed
Remember…
Average = Total ÷ Total
Speed Distance Time

2. The tool we use to help us solve for speed, distance or time is a formula triangle that we call “D-Street.”
The D stands for
Distance
The S stands for
Speed
The T stands for
Time

3. To use “D-Street,” you cover up the letter that stands for what you are trying to solve for, or what you are trying to find out.
When you cover up the letter of what you are trying to find, the formula to find it will reveal itself!

4. Speed Let’s look at an example…
What is the average speed of a snail that travels 10 meters in 2 hours?
Speed
10 meters
Speed =
2 hours
10 meters
10 meters
2 hours
2 hours
= 5 m/hr
Distance
Time
Speed=

5. Susan ran a 12 km race at an average speed of 3km/hr
Susan ran a 12 km race at an average speed of 3km/hr. How long did it take her to run the race?
Time
12 km
Time =
3 km/hr
12 kilometers
12 km
3 km/hr
3 km/hr
= 4 hours
Distance
Speed
Time=

6. The bus traveled for 6 hours at an average speed of 60miles per hour
The bus traveled for 6 hours at an average speed of 60miles per hour. How far did the bus go?
Distance
Distance =
60 mph X
6 hours
6 hours
60 mph x 6 hours
= 360 miles
60 miles per hour
Distance=
Speed x time

7. Time Now try this one on your own:
How much time will it take to travel 450 km if you keep an average speed of 50 km/hr?
Time
450 km
Time=
450 km
50 km/hr
50 km/hr
450 km
50 km/hr
= 9 hours
Distance
Speed
Time =