Can you solve the jail break riddle

你能解決越獄之謎嗎

來(lái)源視頻

Your timing made you and your partner the most infamous bank robbers in the west.?

Now, you’ll need to use that timing to help you break out of jail.?

At the appointed time, you’ll be walking in the yard near the electric fence.?

Your partner will flash you the signal, and exactly 45 seconds later, short out the fence circuit.?

It’ll automatically restart after a second or two, but as long as you move fast, you’ll be home free.

你的時(shí)機(jī)把控讓你和你的搭檔成為了西方最臭名昭著的銀行劫匪。

現(xiàn)在，你要等待時(shí)機(jī)越獄。

在約定的時(shí)間，?你要走到院子的帶電柵欄旁。

你的搭檔將會(huì)給你發(fā)出信號(hào)，并且在45秒后電柵欄將會(huì)短路。

再過(guò)一兩秒， 電柵欄的電路又會(huì)自動(dòng)重啟，但是只要你動(dòng)作迅速，你就可以越獄成功。

And then you notice, to your horror, that your watch is broken, and there’s no time to fix it.

The signal is coming, and if you make even a small mistake in counting off 45 seconds, you’ll get fried.?

Searching your pockets, you find something that might help: a lighter and two fuses you made earlier in the prison work program.?

Each fuse is a length of flammable twine, built to be lit on either end and burn for precisely one minute.

之后，你驚恐的發(fā)現(xiàn)你的手表壞了，也沒(méi)有時(shí)間去修它。

但是信號(hào)來(lái)了，如果你在數(shù)這45秒的時(shí)候 只要犯了一點(diǎn)小小的錯(cuò)誤你將會(huì)被電焦。

翻了一下口袋，你發(fā)現(xiàn)了一些可能幫助到你的東西：你在之前監(jiān)獄勞改中做的 一個(gè)打火機(jī)和兩條保險(xiǎn)絲。

每一節(jié)保險(xiǎn)絲都是一段易燃的線，可以在點(diǎn)燃任何一端的情況下燃燒一分鐘。

The problem is that even though the fuses look uniform, they don’t burn evenly,?

so if you cut one in half, for example, one side might burn longer than the other.

Your partner is going to give the signal any minute, and you’ll have to make your move.?

How can you use the fuses and lighter to time exactly 45 seconds??

Pause the video to figure it out yourself.?

Answer in 3?

Answer in 2?

Answer in 1

但問(wèn)題是，即使這些保險(xiǎn)絲看起來(lái)很均勻，但它們并不能均勻地燃燒。

所以如果你把它剪成兩段，一段可能會(huì)比另一段燃燒地時(shí)間長(zhǎng)。

你的搭檔會(huì)在任何時(shí)間給你信號(hào)，你不得不行動(dòng)。

你怎么能用打火機(jī)和 保險(xiǎn)絲準(zhǔn)確地計(jì)算45秒呢？

請(qǐng)先暫停視頻， 自己思考一下答案

答案3秒后出現(xiàn)

答案2秒后出現(xiàn)

答案1秒后出現(xiàn)

The length of the fuse may not tell you anything, but you do know the fuses take exactly 60 seconds to burn from end to end.?

Here’s the key insight: If you start a fuse on one side and it burns for 30 seconds, there’ll still be 30 seconds of fuse left.

If you had started it from the other end, it would’ve reached the exact same spot in thirty seconds.?

That means that if you lit it from both ends simultaneously, it would burn out in precisely 30 seconds.

But how will you time the last fifteen?

保險(xiǎn)絲的長(zhǎng)度并不會(huì) 幫助你解決任何問(wèn)題，但你知道保險(xiǎn)絲從一段 燃燒到另一段正好是60秒，

這是解決問(wèn)題的關(guān)鍵，如果你點(diǎn)燃保險(xiǎn)絲的一段并且燃燒了30秒，那么剩余的保險(xiǎn)絲也會(huì)燃燒30秒。

如果你從另一段點(diǎn)燃，那么在30秒的時(shí)候?qū)?huì)到達(dá)和剛才一樣的點(diǎn)。

這就意味著如果你 同時(shí)點(diǎn)燃保險(xiǎn)絲的兩端，這條保險(xiǎn)絲將會(huì)準(zhǔn)確地 在30秒的時(shí)候燃燒完。

但是剩下的15秒怎么辦？

That’ll have to come from the second fuse.?

If it were a 30 second fuse, you’d be able to use that same trick again to double the burning speed and make it last exactly 15 seconds.?

And, you realize, you can shorten the second fuse by lighting one end of it at the same time as you light the first.?

At the moment the first burns out, you’ll be left with 30 seconds on the second fuse.?

Just when you’ve got this all figured out, you see the signal from your partner, and spring into action.

這就要用到第二條保險(xiǎn)絲了，

如果這是一條30秒就能燃燒完的保險(xiǎn)絲，你可以用同樣的方法，兩頭點(diǎn)燃就是正好地15秒。

并且你發(fā)現(xiàn)你可以縮短第二條保險(xiǎn)絲，在你點(diǎn)燃第一條保險(xiǎn)絲的時(shí)候 就點(diǎn)燃第二條的一端。

當(dāng)?shù)谝粭l燃盡的時(shí)候，你會(huì)剩下一條可以在30秒燒完的保險(xiǎn)絲。

正好在你解決了問(wèn)題的時(shí)候，你看到了搭檔的信號(hào)，開(kāi)始行動(dòng)。

You gather the four ends of the two fuses and light three of them.?

The moment the first burns out, you light the other end of the second fuse.?

When it flickers and dies, you know that exactly 45 seconds have passed, and the electric fence is dead.?

By the time it hiccups back to life, you’re over the fence and home free.

你把兩條保險(xiǎn)絲的三頭點(diǎn)燃，

當(dāng)?shù)谝粭l燒盡的時(shí)候，再點(diǎn)燃第二條保險(xiǎn)絲的另一頭。

當(dāng)?shù)诙l也燒盡時(shí)，正好45秒過(guò)去了，此時(shí)電柵欄停止供電。

當(dāng)它再次通電時(shí)，你已經(jīng)越過(guò)了柵欄并且越獄成功。