Help with my math homework!?

Question

Knowing that the distance a runner runs varies directly with the hours of sleep the night before find how far a runner runs on 8 hours of sleep if it is known that a runner ran 5 miles on 4 hours of sleep.

Answer 1

5 miles = 4 hrs

x miles = 8 hrs

Find the relationship between the first and the second equation. The second one is twice as much as the first one so 5 * 2 = 10 miles.

Or u can do a much more mathematical way.

Multiply 5/4 by 8. In case u were wondering what's a 5/4, it's 5miles/4hrs. U have to grab the numbers out of the problem.

8 * 5/4 = 10 miles

Ooooooh!~ They both have the same answer!

Answer 2

5 miles = 4 hours

10 miles = 8 hours

10 miles

Answer 3

8 * 5/4 = 10 miles