12.19 kilometres.
3.28 feets is equals to 1 metre
1000metres= 1km
so that
40000 feets = 40000/3.28 x 1000 km
= 12.19 kilometres
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40000 feet = 7.6 miles
40 km.
0.7 kilometers is 2,296.6 feet.
3.4 kilometers = 11,154.86 feet
200 kilometers = 656,167.979 feet