Math 'n' Logic Puzzles
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The Monk Travel
(solution)

One of the most elegant ways to prove there is a spot along the path that the monk will occupy on both trips at precisely the same time of day is as follows.

The monk starts his way down at the same time as he starts his way up, except several days later - exactly at sunrise. Now let's suppose there are two monks. And they both start their own way, but one starts from the top of the mountain (i.e. descending down) while another - from the bottom (i.e. climbing up). Since there is only a narrow path spiraled the mountain the two monks will definitely meet at some point along the path and at some certain time of day (such a meeting always happens at some certain point of time and place)! This proves that the way up and the way down when are started at some certain time of day (in our case - at sunrise) both have a point along the path which the monk passes at precisely the same time of day.

Karl Dunker himself writes that there are several ways to go about it, "but probably none is... more drastically evident than the following. Let ascent and descent be divided between two persons on the same day. They must meet. Ergo... With this, from an unclear dim condition not easily surveyable, the situation has suddenly been brought into full daylight."

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Last Update
December 7, 2003

 
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