Procedure (1) Set the two microphones a certain distance from one another. Beat two objects that will give a nice tap with a few echoes between them. The difference in the distance between the microphones and the clicking objects represents the distance the sound travelled, and the timing software under Utilities on CYPRESS or in the E: drive will be the time it took the sound to travel the extra distance.
Procedure (2) Set on microphone facing the blackboard or wall. The distance between the beat objects (trapped between the microphone and the wall) is the distance the sound travelled.
Procedure (3) If there is a thunderstorm, have students count the time between the flashes of lightning and the thunder. Otherwise, take them outside and have several of them line up a given distance apart. Tell them to raise their hand when they hear a noise created by another student at the end of the line. Optionally, viseotape the line. Note that the students must be spread over quite a distance for this to work, at least a football field. Only a few students with good reactions should be used for this demonstration