4 people A,B,C and D. The must cross a bridge to the other side. It is dark and they only have one torch. The bridge can only take the weight of 2 people. And when 2 people cross over, the time it takes to cross over is the time of the slowest person. EG A & D cross over it takes 10 mins. Once they have crossed over, a person must travel back with the torch. Find the quickest time...
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