Night, and the last train passes under the bridge. The group must cross the footbridge over the cutting by the light of the porter's lantern. Two people can cross at a time, no more. They walk at the slower person's speed. The lantern must go on every trip, so someone must always walk it back. The crossing can be done in 39 minutes, and not one less. Find the plan that fits the time.
Points for solving; rating never moves in free play.
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