Unofrtunately, the bridge can not handle piggy-backs, but here is the
solution...
John and Billy cross over the bridge 2 minutes
John brings the lantern back 1 minute
Tom and Abraham cross the bridge 10 minutes
Billy brings the lantern back 2 minutes
John and Billy cross the bridge 2 minutes
Total Time: 17 minutes!
> -----Original Message-----
> From: Dan Murphy [SMTP:[EMAIL PROTECTED]]
> Sent: Friday, February 19, 1999 11:42 AM
> To: '[EMAIL PROTECTED]'
> Subject: [RR] Brain Teaser
>
> OK. Here's one for you. Stop me if you've heard this one before.
>
> Four Rangers are on their way to assembly before the evening council fire.
> They come to a small bridge. The bridge is so narrow, only two people can
> cross at a time. They only have one lantern and it is so dark, the
> lantern
> must accompany the persons crossing.
>
> Here's where it gets tricky. Assembly begins in 17 minutes! John will
> take
> 1 minute to cross the bridge. Billy can cross it in 2 minutes, Tom does
> it
> in 5 minutes and Abraham takes ten minutes to cross. When two are
> crossing,
> the faster boy slows down to accommodate the slower boy.
>
> How can all four of them get across in 17 minutes (no more than 2 boys at
> a
> time) understanding that they always need the lantern to cross?
>
> I will post the solution on Monday!
>
> Dan Murphy, Senior Commander
> Outpost 72, Brockton, MA
>
>
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