There are 5280 feet in one mile.
Therefore in 4000 feet there are 4000/5280 miles.
Cancel down by '10'
Hence
400/528
Cancel down by ''8'
50/66
Cancel down by '2'
25/33 miles or in decimal 0.757575.... miles.
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Best part of a mile, I think. 1,375 yards per mile.
I'm thinking that's not what you wanted to ask but as written, the answer is 4000.
253440000 inches = 4000 miles
4000 feet = 1.22 km, approx.
4000 kilometers = 13,123,359.6 feet.