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I need help answering and working out this problem: You are standing in front of a large rock wall and you clap your hands once.

I need help answering and working out this problem:

You are standing in front of a large rock wall and you clap your hands once. You hear an echo 0.5 seconds later. If the echo is from a sound wave that travels at a speed of 343 m/s away from you, how far away is the rock wall? Round your answer to two significant figures.

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