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November 23, 2014

November 23, 2014

Posted by **sam** on Tuesday, December 4, 2012 at 2:05pm.

- math -
**Steve**, Tuesday, December 4, 2012 at 2:44pmIf the 3rd pipe takes x hours,

1/6 = 1/20 + 1/15 + 1/x

x = 20

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