You don't convert from units to "numbers". You convert from one unit to another unit. You can convert from km to meters, to millimeters, or to some other unit of length.
it means how much km per hour it is travelling
555,000,000 km !
4,300,000,000 Km
It is: 820,900,000 km
9,984,670
There's exactly 1 kilometer in a km.
10 KM
3.570 km
0.001 km
6.75 km
1 km = 1000 m192.25 km = 1 922 500 m
1.8 km