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September 19, 2014

September 19, 2014

Posted by **tiffany** on Thursday, August 27, 2009 at 10:52am.

- Math -
**Reiny**, Thursday, August 27, 2009 at 12:04pmBill's rate = lawn/6

Jim's reate = lawn/9

combined rate = lawn/6 + lawn/9

=5lawn/18

Time for combined effort = lawn/[5lawn/18]

= 18/5 minutes

= 3.6 minutes

Notice that "lawn" canceled, so we could have used any constant for "lawn"

in general for individual times of a,b,c,.. units of time

the time for a combined effort would be

1/[1/a + 1/b + 1/c + ...] units of time

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