Rope Question

Discussion in 'Off-Topic Chat' started by lynchie, Oct 29, 2004.

  1. lynchie

    lynchie Active Member

    Ah, time to test the collective brains of banders around the world...

    If you have 2 pieces of rope, both of which take exactly 1 hour to burn from one end to the other, but have varying thickness and weave and so burn at an irregular rate, how can you measure 45 minutes using just the ropes and a lighter?

    (Question stolen from uni magazine)
  2. six pints

    six pints Active Member

    i got it right first!!! yay!!
  3. lynchie

    lynchie Active Member

    yeah... act dumb for a bit could ya...

    actually, just to see how many people get it, pm me when you do...
  4. lynchie

    lynchie Active Member

    well done by the way... i'm truly impressed
  5. six pints

    six pints Active Member

  6. ronnie_the_lizard

    ronnie_the_lizard Active Member

    Nice one.

    If peope are struggling you could give a clue in how many matches they would need to use.......
  7. lynchie

    lynchie Active Member

    Good idea... you will need no matches, just the lighter... ;)
  8. BoBo

    BoBo Member

    Are the two pieces of rope identical?
  9. lynchie

    lynchie Active Member

    Nope, they vary along their length in an irregular manner
  10. ronnie_the_lizard

    ronnie_the_lizard Active Member

    Aaaah ....... yes .......good point ! ;-)
  11. drummergurl

    drummergurl Active Member

    :dunno i struggle with GCSE maths let alone that... sum1 like to help me?
  12. flugelgal

    flugelgal Active Member

    Drummergurl, just think about it carefully. Think what you know for sure about the ropes and use that to help you.

    Lynchie, I've just pm-d you with my solution. :-D
  13. lynchie

    lynchie Active Member

    quite impressed so far... people on tmp are more intelligent than drunk uni students at the 4th best uni in the country...

    ps. we'd like to thank you for all the taxes, they're being well invested... honest...
  14. flugelgal

    flugelgal Active Member

    Our MD is always telling the young 'uns in our Community Band that they're more intelligent than their classmates - apparently pupils who play musical instruments do better in exams. I'm not sure whether that is because intelligent people are more likely to play instruments or whether the instrument playing encourages pupils/students to work harder/more effectively.
  15. lynchie

    lynchie Active Member

    well, pontins is out of the way, so here's the answer...

    Light both ends of one rope and one end of the other. When the first rope is burnt out that's 30 minutes, so then light the other end of the second rope, which has already burnt for 30 minutes so burning from both ends will take a further 15 minutes, giving you 45 minutes!


    Well done to

    Ronnie the Lizard
    Jan H
    Flugel Gal
    and TheMusicMan (who got it on his first attempt, and wanted everyone to know...)

    No prizes unfortunately, just a warm feeling of smug self-satisfaction...
  16. Jan H

    Jan H Moderator Staff Member

    That'll do ;)
  17. flugelgal

    flugelgal Active Member

    So, John, did you manage to find 2 ropes that matched the criteria quite easily then?

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