bartshan-83 Posted July 15, 2010 Share Posted July 15, 2010 YESTERDAY: 1. 1. Seek and ye shall find 2. Mind your P's and Q's. 3. No man is an island 4. Opposites attract 5. To the victor belong the spoils 6. Many a true word is spoken in jest 2. 18 minues TODAY: Four people wish to cross a long bridge in the dark of night, but the bridge will only support a maximum of two people at a time. Furthermore, it's so dark that any bridge-crossers need to carry a flashlight to guide them, and the four people have only one flashlight to use. Walking alone, the four people would take 1, 2, 5, and 10 minutes, respectively, to cross the bridge one way. If two people travel together with the flashlight, they must go as the speed of the slower person. Remember that the flashlight must be brought back across the bridge by someone each time. What is the shortest amount of time it will take to get all four across? Link to comment Share on other sites More sharing options...
shrader Posted July 15, 2010 Share Posted July 15, 2010 The 1 minute person needs to cross each time. 1 and 10 start out (10 minutes). Then 1 goes back (1 minute). 1 and 5 then cross (5 minutes). 1 again goes back (1 minute). All that's left now is for 1 and 2 to cross together (2 minutes). 10+1+5+1+2=19 minutes Your thread title has me thinking there might be more to it, but I'm not seeing it. Link to comment Share on other sites More sharing options...
linksfiend Posted July 15, 2010 Share Posted July 15, 2010 Your thread title has me thinking there might be more to it, but I'm not seeing it. There is more to it. My answer is: 2 min (1+2 cross) + 1 min (1 goes back) + 10 min (5+10 cross) + 2 min (2 goes back) + 2 min (1+2 cross) -------- 17 min Link to comment Share on other sites More sharing options...
shrader Posted July 15, 2010 Share Posted July 15, 2010 There is more to it. My answer is:2 min (1+2 cross) + 1 min (1 goes back) + 10 min (5+10 cross) + 2 min (2 goes back) + 2 min (1+2 cross) -------- 17 min Yeah, that would do it. Of course, these guys could just learn how to throw the flashlight and save some more time Link to comment Share on other sites More sharing options...
justnzane Posted July 15, 2010 Share Posted July 15, 2010 YESTERDAY: 1. 1. Seek and ye shall find 2. Mind your P's and Q's. 3. No man is an island 4. Opposites attract 5. To the victor belong the spoils 6. Many a true word is spoken in jest 2. 18 minues TODAY: Four people wish to cross a long bridge in the dark of night, but the bridge will only support a maximum of two people at a time. Furthermore, it's so dark that any bridge-crossers need to carry a flashlight to guide them, and the four people have only one flashlight to use. Walking alone, the four people would take 1, 2, 5, and 10 minutes, respectively, to cross the bridge one way. If two people travel together with the flashlight, they must go as the speed of the slower person. Remember that the flashlight must be brought back across the bridge by someone each time. What is the shortest amount of time it will take to get all four across? 19 edit link the better idea Link to comment Share on other sites More sharing options...
CountDorkula Posted July 15, 2010 Share Posted July 15, 2010 There is more to it. My answer is:2 min (1+2 cross) + 1 min (1 goes back) + 10 min (5+10 cross) + 2 min (2 goes back) + 2 min (1+2 cross) -------- 17 min dam, yous peoples is smrt. Link to comment Share on other sites More sharing options...
Wooderson Posted July 15, 2010 Share Posted July 15, 2010 There is more to it. My answer is:2 min (1+2 cross) + 1 min (1 goes back) + 10 min (5+10 cross) + 2 min (2 goes back) + 2 min (1+2 cross) -------- 17 min Damn, nice. I came up with the 19 as well but you got me beat. Link to comment Share on other sites More sharing options...
linksfiend Posted July 15, 2010 Share Posted July 15, 2010 Damn, nice. I came up with the 19 as well but you got me beat. Ehh - I should've refrained - it's a classic theory of constraints puzzle - I've seen it once before Link to comment Share on other sites More sharing options...
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