The speed of sound is about 1100 feet/second under common normalconditions. It can vary with altitude, air temperature andpressure; but not by much.The speed of light is about 186,000 miles per second in a vacuumor in air, a really really whole lot faster.So if you were in the last row at a concert, the light from thedrummer drumming would be almost instantaneous but the sound fromthe drumming drummer would take longer to reach you. In fact, ifyou measured the time in seconds from when you saw the drummerdrumming until you heard the drumming of the drum and multiplied itby 11 hundred, you could figure out how far away you were from thedrummer drumming on the drums.