Bridge Crossing

Logic Level 2

Four people need to cross a dark bridge, but at most two people can cross at once. They have only one light to guide them across, so they must walk at the pace of the slower person.

If the times in which they can each cross the bridge are 1, 2, 7, and 10 minutes, what is the shortest time (in minutes) needed for all four to get across the bridge?

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