Which is/are the correct and natural answer(s) to this question?
- It is ten miles far from here.
- It is ten miles far away from here.
- It is ten miles far away.
- It is ten miles away.
- It is ten miles away from here.
Usually you imply the current position in the question, and imply everything except the distance in the answer (as it's given in the question), so it would be just:
If you flesh that out with all the redundancy, you get:
You can of course leave out different parts of the answer, and change the order:
You can use away instead of from here:
Far is an adjective that denotes an indeterminate distance. It's almost synonymous with distant, although that usually denotes a distance which can be measured.
Consequently you can say How far [away] is... because you are asking about a distance which is not known.
For the answer, the distance is known, so far should not be used, and It's ten miles away is correct. Again, distant isn't generally used. It's ten miles distant is technically correct but not idiomatic.
You don't need to add "from here" because you have referenced it in the question, so it's implicit in the answer.
Assuming "ten miles" has to be a part of the answer:
You've already established the starting place in the question:
So the answer need not include this. Ten miles is the shortest possible answer. Ten miles away is good too.
Ditto Cornbreak, Indrek, and JLG.
Let me just add, after seeing options you considered: "Far" is being used as an interogatory word here and would not normally be part of the answer to such a question. Just like if someone asked you, "Who is the owner of the safari park?", you wouldn't reply, "The owner is who Fred Smith," but just "The owner is Fred Smith" or simply "Fred Smith".
Side note: For some reason I've never understood, school teachers in America routinely insist that the answer to a question must include all the information from the question. That is, if a test question asks, say, "On what continent is France located?", the student is expected to answer, "France is located on the continent of Europe". The student who writes simply "Europe" is marked wrong. I always thought this a silly rule. But if you take classes in America, you may have to deal with it.