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There are four people who want to cross a bridge; theyall begin on the same side. You have 17 minutes to get them all across tothe other side. It is night, and they have one flashlight. A maximum of twopeople
can cross the bridge at one time. Any party that crosses, either one or
two people, must have the flashlight with them. The flashlight must bewalked back and forth; it cannot be thrown, for example.Person 1 takes1 minute to cross the bridge, person 2 takes 2 minutes, person 3 takes 5 minutes, and person 4 takes 10 minutes. A pair must walk together at therate of the slower personâ€™s pace. For example, if person 1 and person 4walk across first, 10 minutes have elapsed when they get to the other sideof the bridge. If person 4 returns the flashlight, a total of 20 minutes havepassed and you have failed the mission.