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Message |
    
Tammynx
Moderator/Spanking Aficionado
Username: Tammynx
Post Number: 2041
Registered: 10-2005
| | Posted on Thursday, May 17, 2007 - 01:02 pm: | 
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There are four people that need to walk across a bridge in the
middle of the night to get to the other side. Only two people
can cross the bridge at a time and they have only 1 flashlight,
which they all must use to cross the bridge. They need to cross
the bridge and have all four people on the other side in 17
minutes. One person can cross the bridge in 1 minute, another
person can cross the bridge in 2 minutes, another in 5 minutes
and the other in 10 minutes. How do all four people get across
the bridge in 17 minutes using 1 flashlight?
(No, you cannot
throw the flashlight across the bridge for the other two people
to use to cross over.)
(Message edited by tammynx on May 17, 2007) |
Fanny
Moderator/Spanking Aficionado
Username: Fanny
Post Number: 3211
Registered: 05-2005
| | Posted on Thursday, May 17, 2007 - 08:48 pm: |
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I figured one of these out from Zippo awhile back (a great while back) I will work on this one, but anyone else, please answer before me if you can! 
Queen of Innocence
"Well behaved woman rarely make history"
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Petergrimm
New member
Username: Petergrimm
Post Number: 6
Registered: 05-2007
| | Posted on Thursday, May 17, 2007 - 09:10 pm: |
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Denote the people by numbers equal to the crossing times. Times denote cumulative time to end of each action listed.
1 and 2 cross - 2 minutes,
1 returns - 3 minutes
5 and 10 cross - 13 minutes
2 returns - 15 minutes
1 and 2 cross - arriving at 17 minutes. |
Tammynx
Moderator/Spanking Aficionado
Username: Tammynx
Post Number: 2053
Registered: 10-2005
| | Posted on Friday, May 18, 2007 - 01:45 pm: |
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Good job Peter....except you forgot the part about the flashlight be taken back and forth |
Fanny
Moderator/Spanking Aficionado
Username: Fanny
Post Number: 3214
Registered: 05-2005
| | Posted on Friday, May 18, 2007 - 04:00 pm: |
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The first two people to cross the bridge are the 1 and 2 minute walkers, so that takes 2 minutes
The 1 minute walker recrosses the bridge and gives the 5 & 10 minute walkers the flashlight. Now you are at 3 minutes.
The 5 and 10 minute walkers cross the bridge with the flashlight, now 13 minutes have passed.
The 2 minute walker takes the flashlight back over the bridge (at 15 minutes)
The 1 minute and 2 minute walkers cross the bridge with the flashlight and now all 4 are across the bridge at 17 minutes.
Queen of Innocence
"Well behaved woman rarely make history"
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Shylah
Moderator/Spanking Aficionado
Username: Shylah
Post Number: 1840
Registered: 10-2005
| | Posted on Friday, May 18, 2007 - 05:28 pm: |
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My brain won't digest that!!!
Help me!
I have a cold and I think the medicine is turned my head to jello.
Take my heart and soul. But please don't step on it, it breaks easily.
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