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Originally Posted by sting
Well, after 11 days, he will have climbed 11 meters, so on day 12, he will reach the top.
The only things you possess are a lighter and two ropes with the following property: they burn from end to end in exactly one hour, but they do not burn regularly. Hence, for exemple if you lit one from one end, the first half could burn in 13 minutes, the next quarter in 2 minutes and the last quarter in 43 minutes. Also, the two ropes do not have the same irregularities. The question is: how to accurately measure 45 minutes?
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Hi sting
I see you like puzzles.
The answer is:
You should light at the same time one rope at both ends and the other at one end. When the first rope is fully burnt (30 minutes), light the remaining end of the other! (fully burnt in 15 minutes) :p
But I have a new one. Who knows the answer?
The following incident took place at a jousting tournament.
The Red and the Black Knight stand at opposite ends of the arena. They simultaneously spur their horses and charge. They horse of the Red Knight is slower and so they meet 60m from the nearer end of the arena missing each other. They continue galopping at full speed and turn their horses at the end of the arena (which takes equal time for both of them). Charging again this time they meet 50m from the nearer end and the Red Knight manages to lift his opponent from the saddle.
If both knights rode at constant speed, how long is the arena?