Sound waves travel faster through liquid water than through air. The document presents a problem where a student measures the time it takes for sound to travel 50 meters in air versus water. By calculating the speed of sound using equations that relate speed to the bulk modulus and density of the medium, the student finds it takes approximately 0.0337 seconds for sound to travel in water and 0.146 seconds in air, meaning sound travels around 4 times faster in water. The key factors that influence sound wave speed are the bulk modulus and density of the medium. Liquids have a high bulk modulus and density, resulting in faster sound speeds compared to gases like air.