Comments on: Rope Burning Interview Question http://elliottback.com/wp/rope-burning-interview-question/ Internet & Technology Sun, 22 Nov 2009 02:40:56 -0400 http://wordpress.org/?v=2.8.4 hourly 1 By: John http://elliottback.com/wp/rope-burning-interview-question/#comment-2189784 John Wed, 11 Nov 2009 23:14:43 +0000 http://elliottback.com/wp/archives/2006/11/22/rope-burning-interview-question/#comment-2189784 Cut rope A into two pieces, half way through the middle; light all 4 ends. This should buy you 15 minutes. Light both ends of Rope B, this should bring you 30 minutes. You've now wasted 45 minutes, two ropes and left with a lighter and the wrong smell of burning hemp .. or nylon. Cut rope A into two pieces, half way through the middle; light all 4 ends. This should buy you 15 minutes.

Light both ends of Rope B, this should bring you 30 minutes.

You’ve now wasted 45 minutes, two ropes and left with a lighter and the wrong smell of burning hemp .. or nylon.

]]> By: Sean http://elliottback.com/wp/rope-burning-interview-question/#comment-1781168 Sean Sat, 28 Jun 2008 17:30:41 +0000 http://elliottback.com/wp/archives/2006/11/22/rope-burning-interview-question/#comment-1781168 Yes, Elliot and Anna are correct. The way Rob T and Tang are thinking about it involves lighting from both ends and the each half burns independently of the other half. This would not be true however. If it takes 59 minutes to burn the first half and 1 minute to burn the second half, the rope would still be burned in 30 min. After 1 min, there would be 58 min left to burn the first half and 0 min left to burn the second half--but the flame that burned the second half will begin burning the first half from the other side. Therefore it would take 29 minutes for the second half to burn, and adding that extra one minute from the beginning gives you 30 overall. Yes, Elliot and Anna are correct. The way Rob T and Tang are thinking about it involves lighting from both ends and the each half burns independently of the other half. This would not be true however. If it takes 59 minutes to burn the first half and 1 minute to burn the second half, the rope would still be burned in 30 min. After 1 min, there would be 58 min left to burn the first half and 0 min left to burn the second half–but the flame that burned the second half will begin burning the first half from the other side. Therefore it would take 29 minutes for the second half to burn, and adding that extra one minute from the beginning gives you 30 overall.

]]> By: feriDruri http://elliottback.com/wp/rope-burning-interview-question/#comment-1232800 feriDruri Tue, 05 Feb 2008 19:34:38 +0000 http://elliottback.com/wp/archives/2006/11/22/rope-burning-interview-question/#comment-1232800 Recently a good friend of mine told me to go to the local pharmacy and buy myself Rabeprazole. I am very curious to know what kind of medicine is this? Anyone can help? I will be very grateful indeed. Recently a good friend of mine told me to go to the local pharmacy and buy myself Rabeprazole. I am very curious to know what kind of medicine is this? Anyone can help?
I will be very grateful indeed.

]]> By: Anna http://elliottback.com/wp/rope-burning-interview-question/#comment-1087729 Anna Thu, 20 Dec 2007 11:39:44 +0000 http://elliottback.com/wp/archives/2006/11/22/rope-burning-interview-question/#comment-1087729 Elliott is right, its a matter of common sense, when you start burning from both the ends at the same time say 10:00 AM, by the time the rope is completely burnt, at whatever rate the rope burns on either sides, it will take 30 minutes to burn the entire rope. The left hand side might burn 10% in half hour and the right hand side might burn 90% in the same time doesn't matter. Elliott is right, its a matter of common sense, when you start burning from both the ends at the same time say 10:00 AM, by the time the rope is completely burnt, at whatever rate the rope burns on either sides, it will take 30 minutes to burn the entire rope. The left hand side might burn 10% in half hour and the right hand side might burn 90% in the same time doesn’t matter.

]]> By: Rob T http://elliottback.com/wp/rope-burning-interview-question/#comment-615530 Rob T Sat, 12 May 2007 18:17:56 +0000 http://elliottback.com/wp/archives/2006/11/22/rope-burning-interview-question/#comment-615530 Elliott Back, that's fine, but it still took 59.999 minutes to burn one side and .001 minutes to burn the other -leaving you no certain way to measure 30 minutes. You need a uniform rate or at least the avg rate of time to be the same. I beleive the question is flawed from the start Elliott Back,

that’s fine, but it still took 59.999 minutes to burn one side and .001 minutes to burn the other -leaving you no certain way to measure 30 minutes. You need a uniform rate or at least the avg rate of time to be the same. I beleive the question is flawed from the start

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