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#1
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Cool Math/Logic Problem
Gotta stocking stuffer book of math problems for XMas. Had just glanced it over but then I saw this one. It was composed by Sam Loyd, a very famous 19th century puzzle & chess master.
What I like about it is there's a eureka moment that has nothing to do w/setting up multi-variable equations, or esoteric knowledge. Not real tough, but fun. Here goes. Two ferrys travel across a river all day. The two piers are directly across from each other, and the ferrys always leave at exactly the same time and keep constant speeds. On one trip they pass each other 720 yards from Pier A. On the trip back they pass each other 400 yards from Pier B. How wide is the river? |
#2
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Re: Cool Math/Logic Problem
this answer seems to be easy to be correct, but heres what I got in white below
<font color="white">1120 </font> |
#3
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Re: Cool Math/Logic Problem
Nope. [img]/images/graemlins/wink.gif[/img]
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#4
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Re: Cool Math/Logic Problem
[ QUOTE ]
Nope. [img]/images/graemlins/wink.gif[/img] [/ QUOTE ] lol, I knew that couldnt be right...oh well [img]/images/graemlins/frown.gif[/img] |
#5
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Re: Cool Math/Logic Problem
i got the same answer, damn, i guess ill have to think harder before reading any other's posts.
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#6
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Re: Cool Math/Logic Problem
do the speeds of each boat ever change?
in other words we have ferry 1 and ferry 2. say ferry 1 travels at speed X, ferry 2 travels at speed Y. does ferry 1 always travel at X? does ferry 2 always travel at Y? of course they don't have to from the wording, but i'm asking. if they DO always go at the same speed, then the problem makes no sense and has no solution. if they DON'T, then the problem has an infinite number of solutions. |
#7
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Re: Cool Math/Logic Problem
I prolly shoulda just copied the problem word for word from the book, but its not that complicated. Yes, for these two trips Ferry1 is traveling at a constant speed X and Ferry2 at constant speed Y, but that's not the key to it. It's not a per se math problem.
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#8
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Re: Cool Math/Logic Problem
</font><blockquote><font class="small">In risposta di:</font><hr />
I prolly shoulda just copied the problem word for word from the book, but its not that complicated. Yes, for these two trips Ferry1 is traveling at a constant speed X and Ferry2 at constant speed Y, but that's not the key to it. It's not a per se math problem. [/ QUOTE ] <font color="white"> so is it a trick question like that monopoly joker? if not, it's impossible. the boats would always meet each other 720 yards from ONE of the piers, and it would alternate, so if you say they met 720 yards from A the first time, they would meet 720 yards from B the second time. but you say 400 from B.. breakdown.....</font> |
#9
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Re: Cool Math/Logic Problem
No, its not a trick. I don't think I made a mistake in the initial post but I can check. Don't have the book here tho.
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#10
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Re: Cool Math/Logic Problem
Solution in white:
<font color="white"> 1440 </font> |
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