Question: What is the speed of light in km?
Disambiguated questions and answers: question: What is the theoretical speed of light (c) in km/s?
What is the speed of light in km/h?
What is the speed of light in air in km/s?
answer: approximately 300000 km/s
299792.458
1080000000
299700 km/s
Natural Questions answer: 300,000 km / s (from the Wikipedia article "Speed of light")