Well there's 1,000 metres in a kilometre (kilo = 1,000) so that would be 40. Assuming you are using the "." in the same way I use a comma ",". If you are not then the additional Zeros are not needed as 40.0 40.00 or 40.000 is the same as 40 metres which would be 0.04 km
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40 km.
40,000
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
No.
It is approx 34674 km.