I believe you mean 425 miles.
There are 5280 feet in one mile (note there are 1760 yards in 1 mile, and there are 3 feet in 1 yard). Therefore there are 5280 feet in 1 mile.
Therefore in 425 miles there are 5280 x 425 feet= 2244000 feet
(which is just over 2 million feet !)
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