Professor Al’s Books

Professor Al has put the “Lord of the Rings” trilogy books on his shelf in order, next to each other. The books are hard copies, with pages which are 1/100in thick and covers which are 1/8in thick. A worm is eating its way from the first page of the first volume to the last page of the third volume. If each of the volumes contains 400 pages, how long this distance is?

The first page of the first volume and the last page of the third volume are separated only by the second volume and the extra 2 book covers. Therefore the distance is 4in + 0.5in = 4.5 inches long.

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