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But How Do You Cross It?

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Posted by Rich on September 11, 2002 16:19:48 UTC

Isn't this problem indeterminate?

Each board will act as a cantilever. You walk out so far on Board 1, and it will fall in. The distance you can walk out would be dependent on the weight of person crossing the board, and indeed, the board itself.

Then, to add the second board, you must support it somehow, obviously the far end by the castle. The other end will rest on the first board. Assuming you could even get the second board to stay on, how can you cross this bridge without knowing the weight it can support. A mouse could pass on it, but a hippo couldn't.

Besides, the IQ question asks nothing about the maximum width of the moat. The obvious answer is < 20'. I'll stick with that, however, my solution would be to swim the moat holding the boards above the water.

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