How much time elapses between the instant the fan sees a batter hit the ball and the moment the fan hears the sound?

Question

A baseball fan sitting in the "cheap seats" is d = 122 m from home plate (see the figure below). How much time elapses between the instant the fan sees a batter hit the ball and the moment the fan hears the sound? (Assume the speed of sound is 344 m/s, and the vertical distance can be ignored.)

Answer 1

Well, if the speed of sound is given, as is the distance between the observer and the event, how long does it take the sound to travel that distance?

This is analogous to asking how long it would take you to travel x meters if you were traveling at speed v meter/sec.