Saturday, December 17, 2016
Four people have to cross a bridge. It is night and pitch dark and they have only one lantern. Also only two people can cross the bridge at a time. Of the four persons, one of them can cross the bridge in 1 minute, another take 2 minutes to cross over, the third person needs 5 minutes and the last one can only do so in 10 minutes. The bridge has to be crossed in 17 (seventeen) minutes. How can all four cross the bridge?