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-   -   Puzzle for 23rd Jun 2009 (http://www.go4expert.com/contests/puzzle-23rd-jun-2009-t18159/)

shabbir 23Jun2009 20:54

Puzzle for 23rd Jun 2009
 
Four people are stuck on one side of the bridge and opposition Army is approaching to kill them. They should cross the bridge in minimum time possible.

Crossing time needed for each.

Soldier - 1 Min
Gunman - 2 Min
King - 5 Min
Queen - 10 Min
Torch ( As much as by the person carrying it )

Conditions:
  1. Only 2 people can cross the bridge as its not well built.
  2. Torch should be always with somebody when crossing as its dark.
  3. Torch cannot be thrown as bridge is wider than any human can throw the torch on other side.
  4. Time taken by 2 persons are of the one who is slowest.

SaswatPadhi 23Jun2009 21:05

Re: Puzzle for 23rd Jun 2009
 
This is a famous puzzle :D
[See : http://en.wikipedia.org/wiki/Beatles_Concert_Puzzle]

I think the optimal solution is :

TIME xxxxxx MOVEMENT
0
+2xxxxxxxxxSoldier and Gunman move to opposite side.
2+1xxxxxxxxxSoldier comes back.
3+10xxxxxxxxKing and Queen move to opposite side.
13+2xxxxxxxxGunman comes back.
15+2xxxxxxxxSoldier and Gunman move to opposite side.
17xxxxxxxxxxAll have crossed safely :)

So, minimum time to cross is 17 mins :hurray:

nimesh 23Jun2009 21:51

Re: Puzzle for 23rd Jun 2009
 
The other solution would be that Gunman comes first and Soldier comes later.
But in any case, 17 would be the minimum time taken for all to cross the bridge.

Nice Reply Saswat.:2thumbsup

mayjune 23Jun2009 21:55

Re: Puzzle for 23rd Jun 2009
 
thats two in a row.... :)

shabbir 24Jun2009 09:06

Re: Puzzle for 23rd Jun 2009
 
I knew about this but I changed and framed the question a bit different hoping Saswat would not know it :D

SaswatPadhi 24Jun2009 12:28

Re: Puzzle for 23rd Jun 2009
 
Thanx nimesh and MayJune. :)

Quote:

Originally Posted by shabbir (Post 50362)
I knew about this but I changed and framed the question a bit different hoping Saswat would not know it :D

Why are people targeting me ? LOL !?! :D

mayjune 24Jun2009 13:04

Re: Puzzle for 23rd Jun 2009
 
They say, when everyone is criticizing you (targeting you) you are on the right track :D

shabbir 24Jun2009 14:05

Re: Puzzle for 23rd Jun 2009
 
Quote:

Originally Posted by mayjune (Post 50373)
They say, when everyone is criticizing you (targeting you) you are on the right track :D

And Famous


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