jueves, 17 de febrero de 2011

Don't be late!

You are in a room and you have the following materials: Two identical ropes and a lighter. You know that if you burn one of this ropes, it takes exactly one hour to burn completely.
You have to measure a period of 45 minutes, using only these items, How will you do it?
The ropes don’t have to burn at a uniform rate (half of the rope doesn't have to burn in half an hour necessarily)

1 comentario:

  1. Hello,
    This puzzle is similar to another puzzle from the movie about two sand clocks:)