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Pastimes
Time for anything Mental?
An SI Board Since June 1997
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Emcee:  desert fox Type:  Unmoderated
There are more than a few intelligent people on this thread. Some are supposed to be outright geniuses while others perform technical analyses that seem like only a Ph.D. can do.

Well, for those with time to spare from analyzing the internal workings of the market, I put forth a mental challenge for all you clever people.

Four Men and a Bridge:

At night, four men must cross a bridge with no lights. The bridge can only support a maximum of two men at a time walking side by side. The pair must carry the group's only flashlight with them. The time it takes to cross the bridge for each man is: 1, 2, 5, and 10 minutes. For example, if the 10 & 2 guys go across, it will take them 10 minutes since the slowest guy in the pair will determine the time. The flashlight must then be carried back so another pair can cross; it cannot be thrown back, it must be carried back.

The flashlight's battery only lasts 17 minutes. How would the group match pairs to cross the bridge within this time?

DF
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ReplyMessage PreviewFromRecsPosted
69 Hi, August! I did have it memorized once, but have since forgotten it and havePami-9/3/1999
68 little dusty around here. Have you memorized your phone number yet?AugustWest-9/3/1999
67 You have the answer, but the reasoning to get there is somewhat different. If Fred McCutcheon-7/1/1997
66 Michael! Thanks for the number but haven't tried it and won't...ignoraPami-6/28/1997
65 > A circular hole is drilled through the center of a solid sphere. The heighFuzzFace-6/28/1997
64 Micheal: > It's more likely that Jill has a daughter. < Correct FuzzFace-6/28/1997
63 Pam, Speaking of telephone numbers, have you tried the automated phone IQ testMichael Coley-6/28/1997
62 Hey, I found! Here it is! It could be either 879-9912 or 989-9901! But donPami-6/28/1997
61 You are correct. The closest that I've come to being a computer programmerTony Johns-6/28/1997
60 RE: Jill and Jane's Children. Edwin, <i>>> Jill and Jane eachMichael Coley-6/28/1997
59 Hey, DF! Dad things come before ALL ELSE! If everyone would remember that, my Pami-6/28/1997
58 Hi Pam, I haven't figured out how to mathematically set up your phone probdesert fox-6/28/1997
57 Thanks, Guys! It's all as clear as mud! But, I'm always willing to leaPami-6/28/1997
56 Another Marilyn Vos Savant conundrum, slightly reworded: Jill and Jane each haFuzzFace-6/28/1997
55 > Or is this where the controversy comes into play? < Precisely! The keFuzzFace-6/28/1997
54 Pam: Think of it this way. When you have your original door your chances areTony Johns-6/28/1997
53 Edwin! But if you already know there is nothing behind the first door, then whPami-6/28/1997
52 Pam, right choice! Your prize is a PhD in mathematics from the <b>Mont&lFuzzFace-6/28/1997
51 Edwin! I loved Let's Make a Deal, and always picked the wrong door. But Pami-6/28/1997
50 You are the contestant in <b>Let's Make A Deal</b>. Monty Hall FuzzFace-6/28/1997
49 I thought it was some sort of mathematical code at first look. I should have ldesert fox-6/27/1997
48 Hey, where is everybody??? I need help!!! I'm having trouble remembering Pami-6/27/1997
47 OK, you guys! No takers on my puzzle??? Here's the answer! HARD+HOKY=LOLYPami-6/27/1997
46 Len! You are too much! Glad you knew the magic words to reappear! Now, go to yPami-6/26/1997
45 "Pluck your magic twanger froggie!" "Hi ya kids, hi ya hi ya himonkey's uncle-6/26/1997
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