In a library there are 6 books put together as shoown in the image above.
Each book has 20 pages and the width of the 20 pages together is 3cm thick.
The cover of each book is 0.5cm thick.
A book worm makes a hole in the cover of the first book through all the 6 books and comes out of the last book cover.
What is the distance traveled by the worm?
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