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December 20, 2014

December 20, 2014

Posted by **Karen** on Monday, May 18, 2009 at 2:02pm.

- Math -
**Reiny**, Monday, May 18, 2009 at 2:15pmcombined rate = 1/4 + 1/6 + 1/2 = 11/12

so time taken for working at combined rate = 1/(11/12)

= 12/11 hours

or 1 hour and about 5 minutes

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