Question ......5

siggie-reported-by-alarmists
Community Member

on ‎10-05-2014 05:12 PM

There are two ropes that both take exactly 1 hour to burn from end to end. You are unable to cut the rope. How can you burn the two ropes in a total of 45 minutes?



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"High and low pressure systems cause the day-to-day changes in our weather." ...Metoffice.......


siggie-reported-by-alarmists..............
0 Helpful

imastawka
Honored Contributor

on ‎10-05-2014 05:14 PM

 

Light both ends at the same time

0 Helpful

siggie-reported-by-alarmists
Community Member
In response to imastawka

on ‎10-05-2014 05:17 PM

They need to take 45 minutes to burn........ you would do it in 30 minutes.....



____________________________
"High and low pressure systems cause the day-to-day changes in our weather." ...Metoffice.......


siggie-reported-by-alarmists..............
0 Helpful

kopenhagen5
Community Member
In response to siggie-reported-by-alarmists

on ‎10-05-2014 05:59 PM

Both take 1 hour, that means 30 mins each.

 

Wait 15 mins before lighting both.

image host
0 Helpful

the_bob_delusion
Community Member
In response to kopenhagen5

on ‎10-05-2014 06:02 PM

tie one of the rope to the other half way down and go for it. 

0 Helpful

lakeland27
Community Member
In response to the_bob_delusion

on ‎10-05-2014 06:11 PM

place them in a toaster oven for 45 mins

amber-eyed-girl
Community Member

on ‎11-05-2014 01:03 AM

I would not burn them, I'd sell them to David Copperfield. Precision rope burning is everything in his line of work.

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Buttercup: You mock my pain! Man in Black: Life is pain, Highness. Anyone who says differently is selling something.

amber-eyed-girl
Community Member

on ‎11-05-2014 01:16 AM

OK

Serious look at it now...

Two ropes, one hour. Want 45 minutes.

Light one of the ropes at both ends, and the other one from one end.

After 30 minutes one rope will be all burnt, and the other will be half burnt.

Then light that leftover half rope again, on the end that's not burning, and it will take 15 minutes for that rope to burn, burning from each end.

45 minutes.

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Buttercup: You mock my pain! Man in Black: Life is pain, Highness. Anyone who says differently is selling something.

View solution in original post

amber-eyed-girl
Community Member
In response to amber-eyed-girl

‎11-05-2014 01:36 AM - edited ‎11-05-2014 01:36 AM

Came to that conclusion by thinking that half of an hour was thirty minutes, and half of that again, was fifteen minutes...added up, the time you want.

And not to have toast at Lakeland's place.

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Buttercup: You mock my pain! Man in Black: Life is pain, Highness. Anyone who says differently is selling something.