Four people are trying to cross a bridge. It takes each person a different amount of time to cross the bridge - it takes the first person one minute, the second two minutes, the third five minutes and the fourth ten minutes. They must cross the bridge in pairs, traveling at the slower speed so if the one minute person went with the ten minute person, it would take a total of ten minutes. Since there is only one flashlight one person must come back across the bridge, then another pair can cross. What is the shortest time to get everyone across the bridge?
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No, there is enough data to ans the question... the ans is 17...