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What is the speed of light in one thirtieth of a second?

Distance divided by the speed of light. The distance from China to the United States is about 10000 kilometers, and the speed of light is 300000 kilometers per second. The distance divided by the speed of light is one thirtieth of a second. The speed of light refers to the propagation speed of light waves or electromagnetic waves in vacuum or medium. It is a physical constant, recorded as c, and its exact value is 299792458 m/s.