To calculate the width of a canyon based on an echo time of 0.80 seconds, the speed of sound at 332 m/s is used. The total distance the sound travels is the product of speed and time, which accounts for the sound traveling to the canyon wall and back. Therefore, the sound travels for 0.80 seconds, resulting in a total distance of 265.6 meters. The width of the canyon is half of this distance, measuring approximately 132.8 meters. Understanding this calculation allows for accurate determination of canyon width based on echo time.