[engineer question] burning rope part two

[martyr]

two (ropes are identical) of the same rope as before (http://www.planetside-universe.com/forums/showthread.php?t=25976), 60 minutes end to end...

but they don't burn linearly.

measure 1h15.

[Squeeky]

This didnt need a new thread you spammer.

[martyr]

sure did. only counts as one, since i'm locking part one

: nazi :

[Squeeky]

Oh ya, well i dont care about your stupid rope threads :mad:

*blood squirts from ear*

ARRRRRRRGHHHHHHHHHHHHHH

[Jaged]

Burn one rope all the way and then burn 1/4 of the other rope. This is easy.

[martyr]

Burn one rope all the way and then burn 1/4 of the other rope. This is easy.

ropes burn non-linearly

[Smaug]

Bring a watch to the rope burning session.

[martyr]

but a watch isnt going to make the ropes burn faster or slower

[Squeeky]

Bring a watch to the rope burning session.

You win.

He didnt say "using no other tools" in this one.

[Smaug]

Loopholes pwn

[Ivan]

Thought I'd add this for SDM,

"bumholes pwn."

[Triggar]

Bring a watch to the rope burning session.

The point of the exercise is that you don't have any other method to determine the passage of time, and the burning of the ropes is your way to determine when 75 minutes has elapsed.

[martyr]

i'll reiterate:

burn the ropes so that they extinguish themselves after 75 minutes

[Smaug]

The point of the exercise is that you don't have any other method to determine the passage of time, and the burning of the ropes is your way to determine when 75 minutes has elapsed.

Sorry, I already won, no other entries. Pwnt.

[Triggar]

No, you lose. You don't have a watch. You were in a car accident in the middle of the winter and everything around you broke and all you have is a rope and a match. Help will be there in 75 minutes.

[Smaug]

Ok, after thinking about it, here is my serious answer:

Fold one rope once, then twice, then cut off a quarter of the rope. Burn one whole rope, then burn the quarter piece of rope.

[Triggar]

But

they

don't

burn

linearly

That is, burning half the rope does not equal 30 minutes

[Smaug]

Stop being a party pooper.

[ObnoxiousFrog]

Fuck it/go bowling. In that order.

[Smaug]

Fuck it/go bowling. In that order.

BUT THE ROPE IS NON-LINEAR. You can't have sex with it.

[Triggar]

:lol:

Smart asses.

NO JOB IN BANGALORE FOR YOU!

[AztecWarrior]

:lol:

Smart asses.

NO JOB IN BANGALORE FOR YOU!
MOVE UP THE BANGALORES!

CLEAR THE SHINGLE!

*boom*

*Troops move up Omaha beach*

[Smaug]

I can burn both ropes for 45 minutes, but I can't figure out 75 yet...

[Jaged]

No, you lose. You don't have a watch. You were in a car accident in the middle of the winter and everything around you broke and all you have is a rope and a match. Help will be there in 75 minutes.
Sit around and have fun burning shit for 75 min until the help comes?

[martyr]

I can burn both ropes for 45 minutes, but I can't figure out 75 yet...

how are you burning the ropes for 45?

[AztecWarrior]

Sit around and have fun burning shit for 75 min until the help comes?
You could use the lighter as a guide for the vehicle coming in to help you. Save the gas and live.

[Smaug]

Light rope 1 at both ends. Light rope 2 at one end. Rope 1 will burn all the way in half an hour. At that point light the second end of rope 2. When both ends meet on the second rope, 45 minutes will have elapsed.

[oddfish]

too bad counting it off in your head isn't exact. 1 onethousand, 2 onethousand. i dunno. bananas.

i say you take an identical rope and start burning it fifteen minutes after you start burning the other rope. maybe i'm just a retard.

the rope is supposed to burn for 60 minutes, right?

If you get another rope just like it, then it should burn in the same amount of time. i dont know what i'm talking about anymore. i am retarded. i think i'm doing something wrong or misreading the problem i am retarded malfunction malfunction malfunction

[Triggar]

THe ropes still take 60 minutes each to burn completely. And there is no pattern to the rate of burn - i.e. one inch of rope does not burn in one second, et cetera.

[ObnoxiousFrog]

MOVE UP THE BANGALORES!

CLEAR THE SHINGLE!

*boom*

*Troops move up Omaha beach*

WHO ARE YOU!

COMBAT ENGINEER, WE'RE BLOWING THESE BARRIERS TO MAKE HOLES FOR THE TANKS!

ARE YOU NUTS? THESE ARE THE ONLY COVER BETWEEN HERE AND THE SHINGLE!

WELL MOVE UP, WE'RE BLOWING 'EM!

*snipered*

[Spee]

MOVE UP THE BANGALORES!

CLEAR THE SHINGLE!

*boom*

*Troops move up Omaha beach*


RARARARAVINDIESELRUINSMOVIE!!

[oddfish]

this is a bullshit problem.

i've got an I.Q. of 154 and i can't fucking figure this out. i'm probably just too distracted to come up with something.. i'm playing battlefront, muahahaha

150, sorry.. my dad has 154... figures.. he owns a fucking print shop. intelligence never seems to end up where it should.

[martyr]

Light rope 1 at both ends. Light rope 2 at one end. Rope 1 will burn all the way in half an hour. At that point light the second end of rope 2. When both ends meet on the second rope, 45 minutes will have elapsed.

you're getting somewhere.

[oddfish]

i feel really stupid.. wow..

[martyr]

hehe, i figured smaug would get it somehow

i have one more. on to the next thread!

[Smaug]

the smartass always prevails.

[oddfish]

set one rope on fire in four different places, and the other at just one end.. har har har

[martyr]

set one rope on fire in four different places, and the other at just one end.. har har har

doesnt work, burns inconsistantly.

[Baneblade]

I am not getting the point to burning the rope. Use it for something constructive and burn the car you just wrecked.

[martyr]

http://www.planetside-universe.com/forums/showthread.php?p=463199#post463199

the point of the burning rope exercise is to demonstrate mental problem-solving capacity to the interviewer, as well as to give the interviewee an example of the sorts of problems they're going to encounter as a software support engineer.

this particular part of the rope problem is also used to suggest another aspect of the puzzle-solving business: the possibility that there is no solution. faced with this option, many of the applicants opted for it quickly, others refused to accept it - neither of which is good neccessarily. of course, you see that there is a solution.

[eXoSloth]

What is the answer for this one?

[Triggar]

Allah Ackbar.

[martyr]

Light rope 1 at both ends. Light rope 2 at one end. Rope 1 will burn all the way in half an hour. At that point light the second end of rope 2. When both ends meet on the second rope, 45 minutes will have elapsed.

smaug is winnar.

[eXoSloth]

smaug is winnar.

Wasn't hte question for 1hr15min? :confused:

[martyr]

he burned one rope for 30 minutes, the other for 45

[eXoSloth]

he burned one rope for 30 minutes, the other for 45

:doh:

DAAAAAAAYYUUMMM I'm stupid.

[edit] Wait, isn't the first 30 part of the 45??

[GraniteRok]

Jaged's answer is correct also.

Both ropes each have a total burn time of 60 min but each have different burn rates.

Since both have the same burn time, burning one completely (60 min) and by quartering (fold rope in half then fold one of the halfs, mark the quarter length) the second one and burning to the quarter mark (15 min) will still give the total burning time of 75 min.

[martyr]

this is true, but smaug used the entire length of the rope, making it the better answer.

(use of all avaliable resources)

also, jaged's marking method introduces error to the timing.

[Smaug]

Actually the total burn time on my solution, is 45 minutes. The first 30 minutes of the 45 minute rope are burning simultaneously with the 30 minute rope.

[JetRaiden]

this thread= :doh:

for me anyway. :D

[SniperDude]

Actually the total burn time on my solution, is 45 minutes. The first 30 minutes of the 45 minute rope are burning simultaneously with the 30 minute rope.

true, rope two burnt half way in the time it took rope one to burn completely, 30 mins. Then the other half of rope two burnt away in 15 mins. Not matter how you look at it, total time is only 45 mins.


Now, if you lay the ropes at right angles to eachother with the end of rope two making contact a quarter of the way up rope one (measured by folding rope one in fourths). Then light the short end of rope one. Rope one will burn for 15 mins before the flame ignites the end of rope two. Rope two will then burn the last 60 mins while rope one burns out. Using all your resources and nothing more.

Not sure if this violates the whole "linear" burning thing, but it's the best I can think of.

L8

[Smaug]

Not sure if this violates the whole "linear" burning thing, but it's the best I can think of.

It does violate it. A quarter of the rope is not neccesarily a quarter hour.

[SniperDude]

Then how'd they get past the first one by folding the rope in quarters to burn for 45 mins?

[Rayder]

Reading is knowledge, knowledge is power, and power is great!

[Smaug]

Then how'd they get past the first one by folding the rope in quarters to burn for 45 mins?

Because in the first one, it was linear. The conditions in this quizzle are different.

[GraniteRok]

The difference is that both ropes do not have the same burn rate but the burn rate would be linear for each individual rope. The important clue is that both ropes have a total burn time of 60 min.

[martyr]

The difference is that both ropes do not have the same burn rate but the burn rate would be linear for each individual rope. The important clue is that both ropes have a total burn time of 60 min.

not linear, but identical

[SDM]

I would have gotten invoved with this thread earlier, but I was at work. Me and the other engineers were out back smoking rope, and balancing coins on our nipples.

[Smaug]

and designing those little plastic toggle things in your cars that break off, and cost 50 bucks to replace.

[SniperDude]

so, let me get this straight, the ropes but the same amount of time if you burn them from end to end or if you light the entire thing on fire at once?

I'm confused, I think I'm over thinking this I think :doh:
.
.
.
.
I think I need to go to bed :zzz:

[martyr]

oh...

this thread has been un-won. i guess nobody's got 1h15 yet. as you can tell, jaged and smaug are on the right track