Jump to content


Welcome to BrainDen.com - Brain Teasers Forum

Welcome to BrainDen.com - Brain Teasers Forum. Like most online communities you must register to post in our community, but don't worry this is a simple free process. To be a part of BrainDen Forums you may create a new account or sign in if you already have an account.
As a member you could start new topics, reply to others, subscribe to topics/forums to get automatic updates, get your own profile and make new friends.

Of course, you can also enjoy our collection of amazing optical illusions and cool math games.

If you like our site, you may support us by simply clicking Google "+1" or Facebook "Like" buttons at the top.
If you have a website, we would appreciate a little link to BrainDen.

Thanks and enjoy the Den :-)
Guest Message by DevFuse
 

Photo
- - - - -

Dark Phobia


  • This topic is locked This topic is locked
38 replies to this topic

#1 rookie1ja

rookie1ja

    Senior Member

  • Site Admin
  • PipPipPipPip
  • 1336 posts
  • Gender:Male
  • Location:Slovakia

Posted 31 March 2007 - 11:12 AM

Darkness Phobia - Back to the River Crossing Puzzles
One family wants to get through a tunnel. Dad can make it in 1 minute, mama in 2 minutes, son in 4 and daughter in 5 minutes. Unfortunately, not more than two persons can go through the narrow tunnel at one time, moving at the speed of the slower one.
Can they all make it to the other side if they have a torch that lasts only 12 minutes and they are afraid of the dark?

This old topic is locked since it was answered many times. You can check solution in the Spoiler below.
Pls visit New Puzzles section to see always fresh brain teasers.


Spoiler for Solution


Spoiler for old wording

  • 0

rookie1ja (site admin)
Optical Illusions
Support BrainDen

"To start: Press any key... Where's the 'any' key?" - Homer Simpson


#2 colorclown26

colorclown26

    Advanced Member

  • Members
  • PipPipPip
  • 254 posts

Posted 28 June 2007 - 09:40 PM

hm......
  • 0

#3 Measure

Measure

    Newbie

  • Members
  • Pip
  • 1 posts

Posted 29 June 2007 - 07:19 PM

Sure, they might be able to make it, but by the time they figure out the solution, they'll only have 7 minutes left on that torch. game over, man.
  • 0

#4 oneandonlyJosh

oneandonlyJosh

    Newbie

  • Members
  • Pip
  • 1 posts

Posted 09 July 2007 - 04:26 AM

Of course, one can conquer one's fears. Just walk down the dark tunnel.
1 & 2 go
1 or 2 comes back
4 & 5 go
1 or 2 comes back (the one that didn't come back before)
1 & 2 go

2+1+5+2+2=12 minutes
  • 0

#5 moboo's pain

moboo's pain

    Newbie

  • Members
  • Pip
  • 14 posts

Posted 14 July 2007 - 07:08 PM

or they can just go single file through the tunnel and wat kind of tunnel can only have two people abroad?
  • 0

#6 Wolken

Wolken

    Newbie

  • Members
  • Pip
  • 2 posts

Posted 17 July 2007 - 02:37 PM

through the tight tunnel can go at once not more than two persons moving....

WTF? I dont think that makes any sense.
  • 0

#7 apa

apa

    Newbie

  • Members
  • Pip
  • 3 posts

Posted 18 July 2007 - 06:58 AM

Apparently the tunnel has a weak bridge going through the entire thing.
  • 0

#8 tfitz11

tfitz11

    Newbie

  • Members
  • Pip
  • 2 posts

Posted 26 July 2007 - 09:12 PM

if its dark outside they're all hosed.
  • 0

#9 spunkalicious

spunkalicious

    Newbie

  • Members
  • Pip
  • 2 posts

Posted 27 July 2007 - 04:57 PM

I would think so because when you add up their times, 1 + 2 + 4 + 5 = 12...but that doesn't include thier going back and forth to hand off the torch, right? So no, it wouldn't really work, unless the torch could fly between them...
  • 0

#10 KBHoleN1

KBHoleN1

    Newbie

  • Members
  • Pip
  • 6 posts

Posted 28 August 2007 - 04:05 PM

through the tight tunnel can go at once not more than two persons moving....

WTF? I dont think that makes any sense.


It's sort of Old English, but it's grammatically correct.

Think of it like this: through the tight tunnel, can go, at once, not more than two persons. Some pauses are required to get the meaning of the sentence.
  • 0




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users