The speed of light in vacuum is about: A3 × 10⁵ km/s B3 × 10⁸ km/s C3 × 10⁶ m/s D3 × 10³ km/s Tap an answer to check. Show the answer Answer: A. 3 × 10⁵ km/s About 3 × 10⁸ m/s, which is 3 × 10⁵ km/s. Report a problem The answer is wrong Spelling or typing mistake The question is unclear Out of date Something else Send