How fast does sound travel?

When a gun is fired at a distance of several hundred yards from an observer, he first sees the smoke and then hears the report. When a distant locomotive whistles, the steam from the whistle is seen a few seconds before the sound of the whistle is heard. Likewise, a flash of lightning is seen before the sound of thunder reaches us.

Experiments show that the speed of sound in dry air at 0° C. is about 1087 feet per second; this speed increases slightly as the temperature rises.