How many meters away is a cliff if an echo is heard #1/2# second after you yell hello?

Question

Assume that sound travels at 343 m/s.

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Answer 1 · 2017-07-23T18:22:21

#85,75# m

So the sound to reach you must travel #x# m to the cliff and then
#x# m back to you. The sound travels with a constant speed so :

#d=vt=>2x=vt=>x=(vt)/2=343/4=85,75# m