>>>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.
>>
>>Is it necessary for him to get out of the country alive - if he's shot is he buried in his own country ?
>>(sorry, be facetious there - just had a nag at Michel about incomplete specifications).
>
>You are right, of course. It had already occured to me that some readers would think about methods to "get out of the country", though not necessarily alive. In this case, however, the idea is to get out alive.

That being so, shouldn't we be told the guard's country (or will that mess up the riddle)?


>
>Hilmar.