Please answer the equestrians in the picture, if it’s not clear enough I have the questions down below: 2. You click your fingers in a large hall and hear the echo 0.5 seconds later off the back wall. How far is the back wall?

3. A boat sends a sound to the bottom of the ocean and it takes 2 seconds to return to the boat. How deep in the ocean?

An explanation would be great too :)

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