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Lazy fly

Posted on: March 23rd, 2013 by
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A rectangular room is 30 feet long, 12 feet in height, and 12 feet wide. A lazy fly
is resting in the middle of a wall at the end of the room, at a point one foot down
from the ceiling. In the middle of the opposite wall, one foot up from the floor is
a tiny scrap of food. The fly is too lazy to fly and decides to walk to the food at
the other end of the room. What is the minimum distance that the fly must walk?

via AMS puzzle corner

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