How many seconds will it take an echo to reach your ears if you yell towards a mountain 82m away?

To calculate the time it takes for an echo to reach your ears, you first determine the time it takes for the sound to travel to the mountain and back. Sound travels at approximately 343 meters per second in air. For a distance of 82 meters, the total distance for the echo is 164 meters. Dividing 164 meters by 343 meters per second gives approximately 0.48 seconds for the echo to return to you.