Can you solve the bridge riddle? - Alex Gendler

22,057,458 views ・ 2015-09-01

TED-Ed


请双击下面的英文字幕来播放视频。

翻译人员: zongyu guo 校对人员: Gabriella Hu
00:09
Taking that internship in a remote mountain lab
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去深山实验室实习
00:12
might not have been the best idea.
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也许不是一个好主意
00:14
Pulling that lever with the skull symbol just to see what it did
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拉下画着骷髅头的控制杆 仅仅为了看看会发生什么
00:18
probably wasn't so smart, either,
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大概也不是什么明智之举
00:20
but now is not the time for regrets
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但现在可不是后悔的时候
00:23
because you need to get away from these mutant zombies fast.
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因为你得赶紧摆脱这群变异的僵尸
00:28
With you are the janitor, the lab assistant, and the old professor.
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与你同行的还有:门卫、助理和老教授
00:32
You've gotten a headstart, but there's only one way to safety:
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你们甩开了僵尸,但前方只有一条路
00:36
across an old rope bridge spanning a massive gorge.
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横跨大峡谷的古老的吊桥
00:40
You can dash across in a minute,
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你过桥需要一分钟
00:42
while the lab assistant takes two minutes.
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助理需要两分钟
00:46
The janitor is a bit slower and needs five minutes,
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门卫慢一点,需要五分钟
00:49
and the professor takes a whole ten minutes,
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教授需要整整十分钟
00:52
holding onto the ropes every step of the way.
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因为他每走一步都紧紧抓住绳索
00:56
By the professor's calculations,
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教授计算出来
00:58
the zombies will catch up to you in just over 17 minutes,
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仅仅在17分钟之后,僵尸就会追上你们
01:02
so you only have that much time to get everyone across and cut the ropes.
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因此只有这么多时间 让所有人过桥并剪断绳索
01:08
Unfortunately, the bridge can only hold two people at a time.
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不幸的是,吊桥只能承载两个人的重量
01:13
To make matters worse,
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更糟糕的是
01:14
it's so dark out that you can barely see,
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天昏地黑,眼前伸手不见五指
01:16
and the old lantern you grabbed on your way only illuminates a tiny area.
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而你一路提着的灯只能照亮一小块地方
01:21
Can you figure out a way to have everyone escape in time?
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你能想出一个方案,让所有人及时逃脱吗
01:26
Remember: no more than two people can cross the bridge together,
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请记住:吊桥只能承载两个人的重量
01:30
anyone crossing must either hold the lantern or stay right next to it,
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任何人在桥上时必须 要么提着灯,要么紧挨着灯
01:35
and any of you can safely wait in the dark on either side of the gorge.
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任何人都可在峡谷两侧的黑暗中安全等待
01:40
Most importantly, everyone must be safely across before the zombies arrive.
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最重要的是,所有人必须 在僵尸到达之前安全通过吊桥
01:45
Otherwise, the first zombie could step on the bridge while people are still on it.
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否则,当僵尸走上桥时,有人还在上面
01:50
Finally, there are no tricks to use here.
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最后,这里不能使用任何花招
01:53
You can't swing across,
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不能荡过去
01:54
use the bridge as a raft,
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不能把桥用作木筏
01:56
or befriend the zombies.
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不能和僵尸做朋友
01:58
Pause the video now if you want to figure it out for yourself!
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请马上暂停视频 如果你想自己寻找答案
02:01
Answer in: 3
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答案揭晓:3
02:03
Answer in: 2
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答案揭晓:2
02:04
Answer in: 1
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答案揭晓:1
02:05
At first it might seem like no matter what you do,
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起初似乎无论怎么安排
02:08
you're just a minute or two short of time, but there is a way.
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都得超出一两分钟,但可行的方案是存在的
02:12
The key is to minimize the time wasted by the two slowest people
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最关键的想法是 最小化最慢的两个人所浪费的时间
02:16
by having them cross together.
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这可通过让他们一起过桥来实现
02:19
And because you'll need to make a couple of return trips with the lantern,
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因为需要有人提着灯返回
02:22
you'll want to have the fastest people available to do so.
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所以得让速度最快的人来完成这个任务
02:26
So, you and the lab assistant quickly run across with the lantern,
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综上,你和助理提着灯快跑过桥
02:31
though you have to slow down a bit to match her pace.
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虽然你必须为她而放慢一点脚步
02:34
After two minutes, both of you are across,
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但两分钟后,你俩都过桥了
02:37
and you, as the quickest, run back with the lantern.
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速度最快的你提着灯跑回去
02:41
Only three minutes have passed.
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现在仅仅过了三分钟
02:43
So far, so good.
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目前为止,一切顺利
02:44
Now comes the hard part.
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现在最耗时的部分来了
02:46
The professor and the janitor take the lantern and cross together.
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教授和门卫接过灯一起过桥
02:50
This takes them ten minutes
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这用了他们十分钟
02:51
since the janitor has to slow down for the old professor
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因为门卫必须为教授放慢脚步
02:55
who keeps muttering
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教授嘴里咕哝着 也许当初他不该给僵尸夜视能力
02:56
that he probably shouldn't have given the zombies night vision.
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02:59
By the time they're across, there are only four minutes left,
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当他们过桥后,时间只剩下四分钟
03:03
and you're still stuck on the wrong side of the bridge.
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可你仍困在危险的一侧
03:05
But remember, the lab assistant has been waiting on the other side,
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然而让我们回忆一下 就会知道助理在另一侧已经等候多时了
03:10
and she's the second fastest of the group.
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她是一行人中第二快的
03:13
So she grabs the lantern from the professor
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所以她从门卫手中接过灯
03:16
and runs back across to you.
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跑过桥回到你那
03:18
Now with only two minutes left, the two of you make the final crossing.
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现在只剩两分钟,你俩最后一次过桥
03:23
As you step on the far side of the gorge,
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你一踏上峡谷的另一侧
03:25
you cut the ropes and collapse the bridge behind you,
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就剪断绳索,摧毁身后的吊桥
03:28
just in the nick of time.
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这样时间刚好赶上
03:30
Maybe next summer, you'll just stick to the library.
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或许,明年夏天,你只愿泡在图书馆里
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