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#11 Lausus

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Posted 18 March 2008 - 08:02 PM

Or maybe they built two boats and two men lead in one boat with the other two following in their boat.
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#12 angieinchains

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Posted 18 March 2008 - 08:02 PM

and they would need a boat
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#13 Noct

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Posted 18 March 2008 - 08:07 PM

and they would need a boat


Check above posts, they "obviously" need to build one since they didn't have one to begin with ;)
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#14 neida

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Posted 18 March 2008 - 08:09 PM

Well, it is very possible to row a small boat with only one oar, so you wouldn't need two oarmen.


But if one person could row with one oar, then we are back to the original answer of him being the designated oarsman and just goes back and forth. That's why I thought we'd have to make the additional assumption of both having to be there at the same time.

This is all getting very confusing. Surely it can't just be about building a boat with oars and rope (which would more likely be a raft)?? There has to be something missing from this question?

Actually - it can't be about building a boat - because there is the condition that only two can go across at once, which must be imposed by the boat, so the boat must already exist. Otherwise they could just build a boat that would take all four of them.

Edited by neida, 18 March 2008 - 08:11 PM.

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#15 TySim

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Posted 18 March 2008 - 08:12 PM

D'oh - You guys were oh so close -
Spoiler for The Real Deal!

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#16 Lausus

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Posted 18 March 2008 - 08:14 PM

There's definitely information missing. We are just trying to think critically with what we have. We know the number of men, their supplies, and that the only way across the river is a boat that can carry two men at a time. Therefore, they need a boat if they want to cross. Then again, they want to go fishing right? So maybe they should do that first.
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#17 Lausus

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Posted 18 March 2008 - 08:15 PM

D'oh - You guys were oh so close -

Spoiler for The Real Deal!


Sorry, the original problem says the only way across is with a boat. Maybe they had a boat the first time they came, or they didn't originally come from home. Maybe they came from work to the store and so avoided the river.
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#18 Noct

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Posted 18 March 2008 - 08:16 PM

But if one person could row with one oar, then we are back to the original answer of him being the designated oarsman and just goes back and forth. That's why I thought we'd have to make the additional assumption of both having to be there at the same time.

Which is why i suggested that It might be possible to have one person row, but only if he's alone. Conceivably he could switch the oar from side to side of the boat, but if someone was sitting next to him, he wouldn't be able to...

Just a theory
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#19 Noct

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Posted 18 March 2008 - 08:32 PM

D'oh - You guys were oh so close -

Spoiler for The Real Deal!


Who says they crossed a bridge to get to town? They can only cross by boat like the problem says. Just one possibility:

river_crossing_problem.JPG
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#20 Lausus

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Posted 18 March 2008 - 09:50 PM

I like that you included a forest.
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