How about if only one guy goes up a ladder? I think I remember this to be approximately 4/7 of the square of the distance in miles; giving you the number of feet above the water one person would have to be to see the other at water level. This comes out to 157 feet! That is, (16.6*16.6)*4/7 = 157 feet (rounded). Does that seem right to those of you who have real formulas and not a vague recollection like I have above?
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