We can block light by placing obstacles in its path, but it’s much more difficult to block sound. why?

It's harder to block sound because sound waves and transverse waves, causing the sound to bounce off objects. This isn't the same with light. Hope that helps. 

All we have to do is focus on what you want to hear and you can tell your mind to block everything out  and its very easy to block light than noise all you have to do is focus

The speed was not exceeded so it was slow