They are equivalent.
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4 miles=7040 yards
Divide it by 1760 (the number of yards in a mile) to get the answer 4
5280 yards equals 3 miles, so 4 miles is bigger.
.4 miles = .4 x 1760 yards = 704 yards or 2112 feet
4 x 36 = 72 + 72 = 144 so 4 yards is 20 inches bigger