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Sound travels through the air at a constant speed, which is approximately 343 meters per second (or about 1,125 feet per second) in dry air at room temperature. The speed of sound can also be affected by factors such as temperature, humidity, and altitude.

When a ship approaches the shore in dense fog, visibility is very low. To estimate the distance to the shore, the crew on the ship can fire a small cannon. The sound of the cannon firing will travel through the air and eventually hit the shore, creating an echo. The echo will then travel back toward the ship, where the crew can listen for it.

To estimate the distance to the shore, the crew can time how long it takes between firing the cannon and hearing the echo. The time elapsed represents the time it takes for the sound to travel to the shore and back. Using the formula: Distance = (Speed of sound × Time elapsed)/2 We divide by 2 because the time elapsed is for the sound to travel both to the shore and back, and we want the distance only to the shore. By plugging in the speed of sound in the air and the time elapsed, the crew can calculate the estimated distance to the shore. This method is based on the assumption that the speed of sound remains constant throughout the entire journey, and that other factors such as wind and temperature fluctuations do not significantly affect the speed of sound during the short time period of the experiment. While this might not give an exact distance, it provides a rough estimation for the ship's crew to use as a guide when navigating in dense fog.