Physics, 16.04.2021 14:20 ineedhelp773

How far is the boy from the forest if his echo is heard after 3 seconds? PLEASE WRITE DOWN YOUR WORK AND ANSWER, I NEED TO KNOW HOW MUCH SPEED OF SOUND YOU USED.

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How far is the boy from the forest if his echo is heard after 3 seconds? PLEASE WRITE DOWN YOUR WORK...