Well raise the bar with this tricky one. Four people need to - TopicsExpress

Well raise the bar with this tricky one. Four people need to cross a rickety old bridge. There is only one torch between all four and must be used on all crossings. The bridge only holds two people at any time. Well call the people A,B,C and D who take different times to cross. Person A takes 1 minute Person B takes 2 minutes Person C takes 7 minutes Person D takes 10 minutes. Whats the shortest amount of time it will take for all four to cross ?

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