1. The problem statement, all variables and given/known data "an ex-physics student is exploring a cave and he comes to a deep abyss. since he has a stopwatch, he decides to determine how deep the abyss is. He remembers that sound travels at a constant velocity of 345 m/s he drops a rock and times how long it is until he hears it hit the bottom, which is 9.00 s. This is the time it takes to fall to the bottom and for the sound to travel back up to the person. Calculate how deep the abyss is in meters. TWO hints: 1) you msut first determine the part of the 9.00s for the fall and for the sound to travel back up. let x represent the time for the fall, and then (9.00- x) represents the time for the sound to travel back up the abyss. use your formulas so that you can eliminate all vars except for X" 2. Relevant equations I just started in a basic physics class for high school and this is a homework problem that I am absolutely stumped by. I don't understand how to calculate for the time it takes to get down or the time to get back up, cause wouldn't it be like trying to figure out what X and Y are in a formula like 10=xy ? Since there are 2 vars, it's not possible to say that x=5 and y=2.. 3. The attempt at a solution D = ( 345 * 9 ) + (-9.8 * .5 * 9^2) any help would be muc appreciated.