Puzzle #59

Four volumes of Gibbons' Decline and Fall of the Roman Empire stand side-by-side, in order from left to right, on a bookshelf. A bookworm starts at page 1 of Volume I and eats his way straight through until stopping at the last page of Volume IV. If each cover is 1/4 centimeters thick, and each book is 5 centimeters thick without the covers, how far does the bookworm travel?

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