Tuesday, December 6, 2011

How long can this snail get out of the well?

Ok. My dad asked me this question. I just want to share it to you. It's easy, I promise.








A snail on a well 12m depth wants to get out. He can climb 2m at night and slipped 1m by daytime due to the heat of the sun.





How long can this snail get out of the well?|||12 days

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