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 Hungry Ant (Posted on 2005-01-21)
In a huge room lives a very hungry ant. The room is 4 meters wide, 4 meters high and 10 meters long. The ant is on one of the 4x4-meter walls, right in the middle (2 meters from each of the 4x10-meter walls), and 1 meter from the ceiling. Its food is on the opposite wall, also in the middle, but 1 meter from the floor. The poor ant is very hungry, and won't be able to walk more than 13.99 meters without dropping dead. Can it survive? (The ant cannot fly, jump etc.)

 See The Solution Submitted by Detti Rating: 3.3333 (3 votes)

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 re: Unfolding the room | Comment 5 of 15 |
(In reply to Unfolding the room by Juggler)

It is not that you miscalculated, it is that you picked the wrong way to unfold the room.  I actually did try the way you tried before I found the correct way.  Graphically, here's what it looks like:

` _ _ _ _ _ _ _ _ _ _ _ _|       |       |   c   ||       | b     |       ||   a   |       |       ||_ _ _ _|_ _ _ _|_ _ _ _||       |       |       ||       |       |       ||       |       |       ||       |       |       ||       |       |       ||       |       |       ||       |       |       ||       |       |       ||       |       |       ||_ _ _ _|_ _ _ _|_ _ _ _||       |       |   z   ||       |     y |       ||   x   |       |       ||_ _ _ _|_ _ _ _|_ _ _ _|`
` `
You chose the path from b to y, while the correct choice is from a to y (equivalently b to z).
 Posted by David Shin on 2005-01-21 15:07:39

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