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March 1, 2015

Posted by **Trista** on Wednesday, November 7, 2012 at 6:20pm.

- Algebra II -
**Trista**, Wednesday, November 7, 2012 at 7:26pmI no the answer is 6.68. I can't remember how to get this.

- Algebra II -
**Steve**, Wednesday, November 7, 2012 at 7:54pmwork with the amount of job done in one hour. In one hour,

John does 1/11

DeShawn does 1/17

together, they do 1/11 + 1/17 = 28/187

so, to do the whole job, they need 187/28 = 6.68

In general, if there are several people taking a,b,c,... hours to do the job, then working together they can do the job in N hours, where

1/N = 1/a + 1/b + 1/c + ...

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