Keeping the Brain Cells Active

[Steamtrains]

Two books, Volumes 1 and 2, stand side by side, in order from left to right on a bookshelf. Not including bindings, each book is one inch thick, while the bindings are each an eighth of an inch thick.
Starting from page one, Volume 1, a hungry bookworm eats its way to the last page of volume 2. How many inches did he consume?

Wayne

The bindings are on the edge so I will say 2 inches.
Charlie

And the unexposed bindings in the center..?? I say 2-1/4"....