Assume a rock is dropped down a well, but you are on a planet with a gravity constant $g$ (instead of 32 feet per second squared) and a speed of sound $c$ (instead of 1100 feet per second), and that you hear the impact of the rock after $t$ seconds. Then the depth of the well is

feet, where your answer depends on $c$, $g$, and $t$.

Note: Thus you will have a formula that you can use to determine the depth of a well on any planet and in any atmosphere.