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Rickety Bridge Answer

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You can do it!

You can get every one across and disable the bridge just in time!

This is how it is done:

First men across are you and Two minutes. 
Travelling across takes... 
2 minutes
You come back with the torch, adding... 1 minute
Five and Ten minutes cross together, adding... 10 minutes
Two minutes comes back to you with the torch, adding... 2 minutes
You and Two minutes cross together, adding ... 2 minutes

Total time

17 minutes
You are now on the far side of the bridge and can cut it to prevent the enemy crossing.





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