The Collapsing Bridge Puzzle
4 people want to cross it before it will collapse. It is a dark night and there is only one torch between them.Only two people can cross at a time."A" takes a minute to cross."B" takes 2 minutes."C" takes 5and "D" takes 10 minutesHow do they all cross before the bridge collapses?SolutionA and B cross first using up 2 minutes.A comes back making it 3C and D cross making it 13 minutesthen B crosses back over making it 15 minutes.And finally A and B cross together to make it 17 minute
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