Answer:
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"
