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Answer :
The first runner takes 18/3 = 6 hours to run the race.
The second runner takes 18/9 = 2 hours to run the race.
Let the distance of the course be x miles.
We know that the first runner takes twice as long to run the course as the second runner, so the first runner's time is 2x/6 = x/3 hours.
We also know that the second runner runs at 9 mph, so the second runner's time is x/9 hours.
We can now set up a system of equations to solve for x:
x/3 = x/9 + t
x = 3t
t = x/3
Now that we know the time each runner takes to run the race, we can substitute it into the following equations to find the distance of the course:
x/3 = 6
x = 18 miles
Therefore, the distance of the course is 18 miles.
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