The Bookworm's Move

There are three books on a shelf standing side by side as they are normally placed on bookshelf. Each book is 10ml thick. The bookworm eats its way through the first page of the first book to the last page of the last book.

How far did the bookworm move if it can only move in a straight horizontal line?

The Bookworm's Move


30 mm? It must have moved only 10mm! 

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