Posted by **Anonymous** on Tuesday, July 24, 2012 at 12:46pm.

A rolling stone may take two different paths. On path 1, it takes 10 seconds for it to reach the bottom of the hill, while on path 2, it takes it 15 seconds. It is twice as likely to go on path 2. How long does it take it on average? Round your answer to two decimal places.

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