40 km.
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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
4,000 meters = 4 kilometers (1 kilometer = 1,000 meters)
0.9 kilometers=900 meters
1.8
1600