You are biking to the library. When you
are 75% of the way there, you realize
you forgot a book. So you turn around
and head back. When you are of the
way back you realize you don’t need the
book, so you turn around again and bike
3.2 miles back to the library. How far do
you live from the library?

I need just the explanation, I have the answer-
6.4 miles.