Three miles is 15,840 feet @5,280 feet per mile.
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1 mile = 5280 feet5280 ÷ 3 = 1760 feet
2 and 3/4 miles
There are 5280 feet in one mile. Therefore, 16320 feet is equal to 16320/5280 = 3.09 recurring (that is, 3.090909...) miles.
There are 5280 feet in one mile. Therefore, one and two thirds miles is equal to (1 + 2/3) x 5280 = 8800 feet.
One yard is equal to 3 feet, so the ratio is 1 yard : 4 feet. To solve for the equivalent ratio for 18 miles, divide 18 by 1.5 (since 1 mile is equal to 5280 feet, which is 1.5 times longer than a yard). Therefore, the equivalent ratio is 18 miles : 72 feet.