A man who lived in Mexico wanted to cross the Mexico/America border. The bridge which he is to cross is a half mile across, over a large gap. Every three minutes a guard comes out of his bunker and checks if anyone is on the bridge. If a person is caught trying to escape Mexico side to the America side they are shot. If caught crossing the other direction without papers they are sent back. He knows that it takes at least five minutes to cross the bridge, in which time the guard will see him crossing and shoot him. How does he get across?
Once the guard goes into the bunker, the man will start moving from Mexican to American border on the bridge. Just at around 2.5 minutes, the person will turn and start moving towards Mexican border.
In another half a minute, the guard will be out and he will see the man moving towards him. Hence, the guard will assume that the person has come from the other side (total time 3 minutes).
The guard will send back the person to the American border. This way, he can cross the border.
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