A man drops a rock into a well. (a) The man hears the sound of the splash 2.0 s after he releases the rock from rest. The speed of sound in air (at the ambient temperature) is 336 m/s. How far below the top of the well is the surface of the water? I found the correct answer here. =18.4 (b) If the travel time for the sound is ignored, what percentage error is introduced when the depth of the well is calculated?