Question: How far apart are the two boats?

Given: Sound travels 1482 meters/second in water at 20 degrees C
(http://library.thinkquest.org/19537/Physics4.html)

Equation: 1482 meters/second x T seconds delay = (1482T) meters apart

T = .0122 seconds delay (as measured in file HW1.wav using SND)

1482 x .0122 = 18.0804 meters apart

Distance(M) = approx.18 meters apart