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. 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

Light travels much faster than sound. That means you see things before you hear them.

The speed of light (300,000,000 m/s) is so fast that you can assume the fan sees the baseball instantly. There's a tiny delay, but not enough to affect how you answer this problem.

The sound, however, does take some time. It's traveling a distance of 122 meters at a speed of 344 meters per second. Using speed = distance/time -> 344 = 122/time -> time = 0.35 seconds