How about this classical physics problem:

  You drop a rock into a water well. Then you hear the splash. Exactly
10 seconds pass between you letting go of the rock and when you hear the
splash. How deep is the well?

  We can assume that air friction is negligible, that g = 9.81 m/s^2,
and that the speed of sound is 340 m/s.

  Don't just give the answer, also write your whole reasoning.

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                                                          - Warp

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