What is the difference between farther and further?
which part of the dictionary entry did you use to find the answer?

Use “farther” for physical distance and “further” for metaphorical, or figurative, distance. It's easy to remember because “farther” has the word “far” in it, and “far” obviously relates to physical distance.

Explanation:

If you have a Webster's New World dictionary that will help you with the words farther and further.

Hopefully this answer helped you.