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Posted by Denis Borris on 14/9/2009, 10:32 pm, in reply to "Bridge At Midnight"
That puzzle was mine all right, but the wording
on the version you're using is not mine; it was
changed by the site owner.
This is MY original wording:
-we have 11 (yes, eleven) guys ready to cross a bridge
-they have 2 flashlights
-times to cross: 5,10,15,20,30,30,35,45,50,55,65
(like, it takes fastest guy 5 minutes....slowest 65 minutes)
RULES:
-2 guys maximum per flashlight
-each flashlight must be in constant motion; this means that
once a flashlight starts "moving", it must move constantly
until everybody has crossed the bridge, and the moving must
be while crossing back and forth
-once a crosser or 2 crossers (double crosser?) leave one end
of the bridge, they must walk to the other end; no stopping
to rest or turning around allowed
-when 2 are crossing together, the time it takes is the time
of the slowest of the double crossers
-the final crossings must terminate at the SAME time; that is,
both flashlights arrive on the other side at same time; this
rule does not apply at other times: you're welcome
-everything is in integers; no fractional nothing
What is the minimum time in minutes, and how do they do it?
Perhaps you'll have an easier time with this
wording: the answer is MUCH lower than 310.
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