Question

What travels at a rate of 300,000 kilometers per second, or nearly instantaneously?

Answer 1

light

The speed of sound in air is approximately , where is the temperature of the air in Celsius. The speed of light is 300,000 km/sec, which means it travels from one place to another on Earth more or less instantaneously. Lets say on a cool night  air temperature Celsius  you see lightning flash and then hear the thunder rumble five seconds later. How far away  in km  did the lightning strike?.