4 miles is greater because it has 21120 feet
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There are about 4 miles in 21000 feet.21000 divided by 5280 (5280 is the number of feet in a mile)
about 4 (3.98) miles
There are 5280 feet in one mile, so in 4 miles there are 5280 x 4 feet, which is 21120 feet.
4 feet 9 inches is greater because it is equal to 57 inches.
There are 5280 feet in 1 mile, so there are 5280 x 4 feet in 4 miles. Plus 3696 feet in 0.7 miles. This gives a total of 24816 feet.