Use the formula D=rt where D is distance, r is rate, and t is time.

Question

40 yard dash: Julio took 4.39 seconds, Rich took 6.18

1. Solve D=rt for rate. (1 pt)
40

2. Use the statistics given in Act Two and your equation from #1.
a. At what speed (rate) does Rich run the 40-yard dash? (1 pt)

b. At what speed (rate) does Julio run the 40-yard dash? (1 pt)

c. Solve D=rt for time. How long does it take Rich to run with a 10-yard lead? (1 pt)

D=30 yds
d. How long does it take Julio to run the 40-yard dash at half-speed? Who will win? (2 pts)

3. If both runners are at full speed, how many yards of a head start will Rich need to win? (2 pts)

4. Write and solve your own question using this scenario. (Remember to show all work!) (2 pts)

Answer 1

Still no ideas at all?

What about the formula confuses you?

D = rt, so
r = D/t

...

Answer 2

When you actually sit down and do the work it becomes confusing