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At a rate of 8 mph, it takes Sam 2 hours to run 16 miles and 1/2 hour to run 4 miles. This is one fit guy.

To figure out the time it takes Sam to run a certain distance, we use this formula:

Time = Distance divided by Rate

Also written as :

T = D/R

Sam enters a 5-mile road race. This is a relatively short distance, so he speeds up to 10 mph. How long will it take him to finish the race? (Hint: Sam's time will be a fraction of an hour.)
Question 9 of 10