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
