***NOT A TEACHER***In the United States, some teachers have this "rule": use "farther" only if you are talking about real distance. So "He is throwing the ball farther" (because it's real distance that you can measure). But: "You will go further in life if you are a nice person."
***NOT A TEACHER***In the United States, some teachers have this "rule": use "farther" only if you are talking about real distance. So "He is throwing the ball farther" (because it's real distance that you can measure). But: "You will go further in life if you are a nice person."
I am more flexible and would say 'go farther in life'. But I think that saying something like 'Farther to the above...' is not acceptable. So, to me, they are not interchangeable. http://dictionary.referencecom/browse/farther