Humming noise that gets louder as I go faster?

Hello,

Any time you hear noises it is best to determine where is the noise is coming from.
If you can hear the noise from the back but it is to left or right and it changes frequency as you speed up it is a good chance the bearing are bad on that wheel.
You can also test the noise by raising the side that you hear the noise and spinning the wheel. Typically you will hear rubbing noise.
In order to replace the hub bearing you will have to remove the brake drum to access it.

Here is a helpful article:

https://www.2carpros.com/articles/bearing-hub-replacement

I have attached diagrams for your reference.

Please let me know of any questions.
Thank you.