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September 19, 2014

September 19, 2014

Posted by **Brian** on Thursday, April 16, 2009 at 7:17pm.

- Algebra -
**Reiny**, Thursday, April 16, 2009 at 9:54pmJose's rate = job/a

Maria's rate = job/b

combined rate = job/a + job/b

= job(a+b)/(ab)

combined time = job/combined rate

= job/[job(a+b)/(ab)]

= ab/(a+b)

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