What Am I Riddles

Question: You may always chase me but you are always about 3 miles away.

What am I?

Question: What has to be broken before you can use it?

Question: With one you can't count past six,
nor can the gap between v and x be fixed.
You can read all of these lines,
but can't say what solves me.

What am I?

Question: Round like a apple, deep like a cup, but all the kings horses can't pull it up.

What is it?

Question: When you do not know what I am, then I am something. But when you know what I am, then I am nothing. What am I?