Can you solve the jail break riddle? - Dan Finkel

4,114,398 views ・ 2019-02-26

TED-Ed


Please double-click on the English subtitles below to play the video.

Prevodilac: Kristina Radosavljević Lektor: Ivana Krivokuća
00:06
Your timing made you and your partner
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Vremenska preciznost je napravila od vas i vašeg partnera
00:08
the most infamous bank robbers in the west.
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najozloglašenije pljačkaše banaka na zapadu.
00:11
Now, you’ll need to use that timing to help you break out of jail.
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Sada ćete morati da je iskoristite da biste pobegli iz zatvora.
00:15
At the appointed time, you’ll be walking in the yard near the electric fence.
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U dogovoreno vreme šetaćete dvorištem, blizu električne ograde.
00:20
Your partner will flash you the signal,
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Vaš partner će vam dati svetlosni signal,
00:22
and exactly 45 seconds later,
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i tačno 45 sekundi nakon toga,
00:25
short out the fence circuit.
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desiće se kratki spoj na ogradi.
00:27
It’ll automatically restart after a second or two,
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Ona će se automatski restartovati nakon sekunde ili dve,
00:30
but as long as you move fast,
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ali dokle god se krećete brzo,
00:32
you’ll be home free.
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bićete slobodni.
00:34
And then you notice,
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Onda primećujete,
00:35
to your horror,
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na svoj užas,
00:36
that your watch is broken,
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da vam je sat polomljen,
00:38
and there’s no time to fix it.
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i nemate vremena da ga popravite.
00:40
The signal is coming,
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Dolazi signal,
00:41
and if you make even a small mistake in counting off 45 seconds,
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i ako napravite i najmanju grešku u brojanju tih 45 sekundi,
00:45
you’ll get fried.
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bićete sprženi.
00:47
Searching your pockets,
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Pretražujući džepove,
00:48
you find something that might help:
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pronalazite nešto što bi vam moglo pomoći:
00:51
a lighter and two fuses you made earlier in the prison work program.
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upaljač i dva fitilja koje ste ranije napravili u okviru zatvorskog programa.
00:56
Each fuse is a length of flammable twine,
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Svaki fitilj je dugačko zapaljivo uže,
00:59
built to be lit on either end and burn for precisely one minute.
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koje se može zapaliti sa obe strane i gori tačno jedan minut.
01:04
The problem is that even though the fuses look uniform,
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Problem je što, iako izgledaju isto,
01:07
they don’t burn evenly,
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fitilji neće goreti jednako,
01:09
so if you cut one in half, for example,
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tako da, ako jedan presečete na pola, na primer,
01:11
one side might burn longer than the other.
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jedan kraj može duže goreti od drugog.
01:15
Your partner is going to give the signal any minute,
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Vaš partner će dati signal za koji minut,
01:17
and you’ll have to make your move.
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i vi ćete morati da delujete.
01:19
How can you use the fuses and lighter to time exactly 45 seconds?
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Kako možete da iskoristite dva fitilja i upaljač za merenje tačno 45 sekundi?
01:24
Pause the video to figure it out yourself.
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Pauzirajte video da biste smislili.
01:29
Answer in 3
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Odgovor za 3.
01:31
Answer in 2
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Odgovor za 2.
01:33
Answer in 1
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Odgovor za 1.
01:35
The length of the fuse may not tell you anything,
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Dužina fitilja vam ne mora govoriti ništa,
01:37
but you do know the fuses take exactly 60 seconds to burn from end to end.
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ali vi znate da im treba tačno 60 sekundi da izgore od jednog do drugog kraja.
01:43
Here’s the key insight:
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Evo ključnog detalja:
01:44
If you start a fuse on one side and it burns for 30 seconds,
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ako zapalite fitilj sa jedne strane i on sagori za 30 sekundi,
01:48
there’ll still be 30 seconds of fuse left.
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i dalje će ostati 30 sekundi fitilja.
01:52
If you had started it from the other end,
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Da ste započeli sa druge strane,
01:54
it would’ve reached the exact same spot in thirty seconds.
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ponovo bi došlo do iste tačke za trideset sekundi.
01:58
That means that if you lit it from both ends simultaneously,
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Što znači da će, ako ih zapalite sa obe strane u isto vreme,
02:01
it would burn out in precisely 30 seconds.
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goreti tačno 30 sekundi.
02:05
But how will you time the last fifteen?
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Ali kako ćete izmeriti ostalih petnaest?
02:08
That’ll have to come from the second fuse.
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To će morati sa drugim fitiljem.
02:10
If it were a 30 second fuse,
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Ako imate fitilj od 30 sekundi,
02:12
you’d be able to use that same trick again
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mogli biste da primenite isti trik ponovo
02:14
to double the burning speed and make it last exactly 15 seconds.
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da duplirate proces sagorevanja i napravite da traje tačno 15 sekundi.
02:19
And, you realize, you can shorten the second fuse
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Shvatate da možete skratiti drugi fitilj
02:22
by lighting one end of it at the same time as you light the first.
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tako što ćete ga upaliti u isto vreme kada upalite i prvi.
02:27
At the moment the first burns out,
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U momentu kada prvi izgori,
02:29
you’ll be left with 30 seconds on the second fuse.
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imaćete preostalih 30 sekundi na drugom.
02:33
Just when you’ve got this all figured out,
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Taman kada ste sve ovo shvatili,
02:35
you see the signal from your partner,
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vidite signal od vašeg partnera,
02:37
and spring into action.
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i krećete u akciju.
02:38
You gather the four ends of the two fuses and light three of them.
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Prikupljate četiri kraja od dva fitilja i palite tri.
02:43
The moment the first burns out,
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U momentu kada izgori prvi,
02:44
you light the other end of the second fuse.
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palite drugi kraj drugog fitilja.
02:47
When it flickers and dies,
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Kada izgori i ugasi se,
02:49
you know that exactly 45 seconds have passed,
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znate da je prošlo tačno 45 sekundi,
02:52
and the electric fence is dead.
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i da je električna ograda mrtva.
02:55
By the time it hiccups back to life,
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Dok se ne povrati u život,
02:57
you’re over the fence and home free.
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vi ćete već biti preko ograde i slobodni.
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