Speed of sound is the distance covered by sound in

First let's define some things.

The speed of sound is defined as the distance that can travel the sound in one unit of time and in a given medium, where the speed of sound will be different in water than in air.

We commonly use the speed of sound as:

343 m/s

This is particularly for dry air at 20°C, and you can see that the time unit is seconds, then:

"The speed of sound is defined as the distance that can travel the sound in a second, and in a given medium, dry air at 20°C in this case"

in this image, you can see solar radiation going through ocean water.

no image, but probably absorption