there are 7 miles
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7.
There are 1760 yards in one mile. There are 3 feet in one yard, so there are 5280 feet in one mile. There are therefore 36960 feet in seven miles.
There are 5280 feet in one mile. Therefore, 7 miles is equal to 5280 x 7 = 36960 feet.
1 mile = 5280 feet so 7 miles = 7*5280 = 36960 feet. Simple!
21 miles is exactly 21 miles long or if you prefer 36960 yards long. 21 miles is also 110880 feet long and 1,330,560 inches long.