A prisoner of war manages to escape from his prison, and must now cross the border, to get back to his own country. Specifically, he must cross a bridge across a river. He has the following information:
A guard watches the bridge. However, the guard doesn't watch all the time; he only gets out of his building once every 7 minutes, to look at the bridge.
However, it would take the prisoner 10 minutes to cross the bridge at top speed.
The guard's role is to avoid people coming into, and getting out of, the country. People who try to come into the country are sent back. People who try to get out of the country, however, are shot.
How can our hero get out of the country?
Hilmar.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)
