David hikes 2 ¼ miles in ½ an hour at this rate, how long will it take him to walk 18 miles?

So in 30 min will hike 2 1/4 miles = 9 of those 1/4 miles therefore in 10 min will hike 9/3 = 3 of those 1/4 miles = 3/4 of a mile

3/4 mile in 10 min;

(3/4) • 4 = 3 miles in 40 min;

6 miles in 80 min;

9 miles in 120 min;

12 miles in 160 min;

15 miles in 200 min;

18 miles in 240 min or 4 hours