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Old 23rd September 2012, 12:05 AM   #31
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Me neither. It seems at least 3 trips are required not counting the return time, so it doesn't appear possible in the time allotted.
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Old 23rd September 2012, 12:07 AM   #32
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Me neither. I've gone over and over it. It always comes out to more than 17 minutes. There is a trick I'm missing.
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Old 23rd September 2012, 12:30 AM   #33
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Doing it the simple way you end up with 19 minutes. Must think harder.
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Old 23rd September 2012, 12:52 AM   #34
Pano is offline Pano  United States
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It must be like the farmer, pig potato puzzle. Let's see:
Bono and Edge cross. 2 mins
Bono returns: 3 mins
Adam and Larry cross: 13 mins
Edge returns: 15 mins
Bobo and Edge return: 17 minutes.

They then get high and the concert starts an hour late.
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Old 23rd September 2012, 01:15 AM   #35
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Damn it, I had it figured also. You beat me to it Pano.
I converted them to numbers and realized that the way it added up, 5 and 10 had to cross at the same time while the other two were split on either side. From that point on it was easy. Good going Michael.
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Old 23rd September 2012, 01:47 AM   #36
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I had it figured out as soon as i read it, a simple math problem (shortest tour) there is only one way it could work. But i had to go do the mail.

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Old 23rd September 2012, 02:04 AM   #37
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Good one, Pano. As far as I got was... Bono should carry the flashlight, but that must be the gotcha, so when would he not be the carrier? Knowing now it's the Bono/Edge combo, it also works like this:
Bono and Edge cross: 2 mins
Edge returns: 4 mins
Adam and Larry cross: 14 mins
Bono returns: 15 mins
Bono and Edge return: 17 minutes.

The lion/potato combo was much easier to spot.
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Last edited by sofaspud; 23rd September 2012 at 02:06 AM.
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Old 23rd September 2012, 02:29 AM   #38
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You quickly realize that the two slowest must go together. My big hang up was having Bono carry the light every time because he's the fastest. I just kept sending them over the bridge until I worked it out. It's that extra trip, like with the boat that does the trick. They deserve a good toke, now.
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Old 23rd September 2012, 03:29 AM   #39
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I can be a little slow myself. I didn't realize the answer to my question was "when the two slowest cross" until it was too late.
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Old 23rd September 2012, 09:46 AM   #40
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Just for fun..
No cheating..

A princess is as old as the prince will be when the princess is twice the age that the prince was when the princessís age was half the sum of their present ages.

What are their ages?

Regards
M. Gregg
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