15 feet = .002841 miles
5280 feet = 1 mile
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There are 5280 feet in 1 mile, so there are 5280 x 15 feet in 15 miles, which is 79200.
15 miles
There are 5280 feet in one mile. Therefore, 79200 feet is equal to 79200 / 5280 = 15 miles.
10 miles = 52,800 feet, thus there are 52,800 x 15 = 792,000 ft2 of sidewalk (or pavement)
1 mile per hour = 22/15 = 1.4666... feet per second (rounded, repeating)The following are exact numbers:-- 15 miles per hour = 22 feet per second-- 30 miles per hour = 44 feet per second-- 60 miles per hour = 88 feet per second-- 90 miles per hour = 132 feet per second-- 120 miles per hour = 176 feet per second