Conversion from kilometers to meters is just moving the decimal point three places to the right. 220 km = 220000 m
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299 792.458 km s-1.This is not an approximate figure - it is exactly right by definition.If there was a tiny error it will be corrected by adjusting the meter !
299792.458 km/s x 480 s ≈ 143,900,000 km
Twenty cm-s higher than a metre, altogether 120 cm, or 1200mm (or 0.12 km).
100 centimeters.
m/s * .001 km/m * 3600 s/hr = m/s * 3.6 km.s/m.hr the conversion factor is therefore 3.6