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bridge and torch problem
Richard Hovasse's bridge and torch problem (also known as ''The Midnight Train''〔(【引用サイトリンク】url=http://www.murderousmaths.co.uk/books/BKMMPxbb.htm )〕 and ''Dangerous crossing''〔(【引用サイトリンク】author=Gleb Gribakin )〕) is a logic puzzle that deals with four people, a bridge and a torch. It is one of the category of river crossing puzzles, where a number of objects must move across a river, with some constraints.〔(Tricky Crossings ), Ivars Peterson, ''Science News'', 164, #24 (December 13, 2003); accessed on line February 7, 2008.〕
==Story==
Four people come to a river in the night. There is a narrow bridge, but it can only hold two people at a time. They have one torch and, because it's night, the torch has to be used when crossing the bridge. Person A can cross the bridge in one minute, B in two minutes, C in five minutes, and D in eight minutes. When two people cross the bridge together, they must move at the slower person's pace. The question is, can they all get across the bridge in 15 minutes or less?〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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