"Look out! That old abandoned well is very dangerous, Huck. I think that it should be capped so that nobody could fall in and kill his self." "Ah, shucks, Tom, let's climb down and see how deep it is. I'll bet it is a mile down to the bottom."

If we assume that it is not possible for Tom or Huck to climb down into the well, how can they find out the depth of the well? Assume that the well is a mile deep and explain how Tom and Huck might determine this fact. the time it takes to hit the bottom. It will take 18 seconds.