If a splash is heard 4.23 seconds after a stone is dropped into a well 78.4 m deep, then the velocity
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summing no air (or air drag) on stone, the time it takes stone to reach water is:
t = √2h/g = √2(78.4)/9.81 = √15.98369 = 3.998 s
time for sound to travel 78.4 m = 4.23 - 3.998 = 0.232 s
speed of sound in well = 78.4/0.232 = 338 m/s ANS*
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