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bridge puzzle classic

#1 User is offline   Trumpace 

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Posted 2007-November-02, 14:58

If you know this already, please don't answer too soon.


"U2" has a concert that starts in 17 minutes and the group members must all cross a bridge to get there. All four men begin on the same side of the bridge. You must help them across to the other side. It is night. There is one flashlight. A maximum of two people can cross at one time. Any party who crosses, either one or two people, must have the flashlight to see. The flashlight must be walked back and forth, it cannot be thrown, etc. Each band member walks at a different speed. A pair must walk together at the rate of the slower man's pace, based on this information:

* Bono: - 1 minute to cross

* Edge: - 2 minutes to cross

* Adam: - 5 minutes to cross

* Larry: - 10 minutes to cross


For example: if Bono and Larry walk across first, 10 minutes have elapsed when they get to the other side of the bridge. If Larry then returns with the flashlight, a total of 20 minutes will have passed and you will have failed.


Note: There is no "trick" behind this. It is the simple movement of resources in the appropriate order.


(Almost verbatim from: http://members.aol.c...r/BrdgPuzl.htm)
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#2 User is offline   jonottawa 

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Posted 2007-November-02, 15:16

Very clever. Solved.
"Maybe we should all get together and buy Kaitlyn a box set of "All in the Family" for Chanukah. Archie didn't think he was a racist, the problem was with all the chinks, dagos, niggers, kikes, etc. ruining the country." ~ barmar
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#3 User is offline   jdonn 

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Posted 2007-November-02, 15:30

Excuse me, no bridge-related discussions in the water cooler please! TY
Please let me know about any questions or interest or bug reports about GIB.
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#4 User is offline   Trumpace 

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Posted 2007-November-02, 15:53

jdonn, on Nov 2 2007, 04:30 PM, said:

Excuse me, no bridge-related discussions in the water cooler please! TY

And the fish is in the net B)
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#5 User is offline   hrothgar 

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Posted 2007-November-02, 16:07

this same problem was posted and solved in the google interview thread
Alderaan delenda est
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#6 User is offline   Foxx 

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Posted 2007-November-06, 19:37

Damn. The best I can do is 19 minutes, by having Bono transport everyone in turn. Doesn't U2 have some cover band that can fill the odd two minutes up? It's interesting to note, I've been to exactly one concert in my life and it was a U2 one...
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#7 User is offline   jonottawa 

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Posted 2007-November-06, 19:41

Foxx, on Nov 7 2007, 01:37 AM, said:

Damn. The best I can do is 19 minutes, by having Bono transport everyone in turn.

That's the intuitive solution. That's what makes it a good puzzle.
"Maybe we should all get together and buy Kaitlyn a box set of "All in the Family" for Chanukah. Archie didn't think he was a racist, the problem was with all the chinks, dagos, niggers, kikes, etc. ruining the country." ~ barmar
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