SOLUTION: Assuming the speed of sound is 344 m/s How far away is the canyon wall if it takes 4.7 s to hear the echo after you yell?

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Question 1122253: Assuming the speed of sound is 344 m/s
How far away is the canyon wall if it takes 4.7 s to hear the echo after you yell?
Found 2 solutions by Boreal, ikleyn:
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
The echo is twice the distance, out and back.
So it took 2.35 seconds to reach the wall
477 m/sec*2.35 sec= 1120.95 m or 1121 m.

Answer by ikleyn(52776) About Me  (Show Source):
You can put this solution on YOUR website!
.
I came to fix the solution given by @Boreal. 

    The echo is twice the distance, out and back.

    So it took 2.35 seconds to reach the wall.  

    344 m/sec*2.35 sec= 808.4 m.             <<<---=== my editing is in  this line.