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Pastimes
Time for anything Mental?

An SI Board Since June 1997

Posts	SubjectMarks	Bans
69	2	0

Emcee: desert fox	Type: Unmoderated

Introduction Compact

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

Go to reply# or date (mm/dd/yy):

Reply	Message Preview	From	Recs	Posted
69	Hi, August! I did have it memorized once, but have since forgotten it and have	Pami	-	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...ignora	Pami	-	6/28/1997
65	> A circular hole is drilled through the center of a solid sphere. The heigh	FuzzFace	-	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 test	Michael Coley	-	6/28/1997
62	Hey, I found! Here it is! It could be either 879-9912 or 989-9901! But don	Pami	-	6/28/1997
61	You are correct. The closest that I've come to being a computer programmer	Tony Johns	-	6/28/1997
60	RE: Jill and Jane's Children. Edwin, <i>>> Jill and Jane each	Michael 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 prob	desert fox	-	6/28/1997
57	Thanks, Guys! It's all as clear as mud! But, I'm always willing to lea	Pami	-	6/28/1997
56	Another Marilyn Vos Savant conundrum, slightly reworded: Jill and Jane each ha	FuzzFace	-	6/28/1997
55	> Or is this where the controversy comes into play? < Precisely! The ke	FuzzFace	-	6/28/1997
54	Pam: Think of it this way. When you have your original door your chances are	Tony Johns	-	6/28/1997
53	Edwin! But if you already know there is nothing behind the first door, then wh	Pami	-	6/28/1997
52	Pam, right choice! Your prize is a PhD in mathematics from the <b>Mont&l	FuzzFace	-	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 l	desert 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=LOLY	Pami	-	6/27/1997
46	Len! You are too much! Glad you knew the magic words to reappear! Now, go to y	Pami	-	6/26/1997
45	"Pluck your magic twanger froggie!" "Hi ya kids, hi ya hi ya hi	Elmer Flugum	-	6/26/1997

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