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Eight efficient blacksmiths (Posted on 2015-08-13) Difficulty: 3 of 5
A puzzle by Polish mathematician Paul Vaderlind:

If a blacksmith requires five minutes to put on a horseshoe, show how can 8 blacksmiths shoe 10 horses in less than half an hour?

The catch: A horse can stand on three legs, but not on two.

See The Solution Submitted by Ady TZIDON    
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Solution re: solution | Comment 2 of 4 |
(In reply to solution by Charlie)

Of course to lessen the changes of horse and blacksmith, it might be better to keep the same blacksmith with the same horse when possible:

a1 b2 c3 d4 e5 f6 g7 j8
b2 c3 d4 e5 f6 a7 h8 i1
c3 d4 e5 b6 g7 h8 i1 j2
d4 c5 f6 g7 h8 i1 j2 a3
e5 f6 g7 h8 i1 j2 a3 b4

  Posted by Charlie on 2015-08-13 09:31:05
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