21120
5280 feet = 1 mile so 21120 feet = 21120/5280 = 4 miles.
There are 5280 feet in one mile. Therefore, 21120 feet is equal to 21120 / 5280 = 4 miles.
21120!
21120
21120 ft/4 hours = 4 miles/4 hour = 1 mph
0.25
4
21120 feet
4 miles
21120 feet
5280*4=21120 ft.