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January 29, 2015

January 29, 2015

Posted by **bill** on Monday, November 14, 2011 at 12:38pm.

- algebra -
**Reiny**, Monday, November 14, 2011 at 1:49pmMary's rate = lawn/3

Sally's rate = lawn/5

combined rate = lawn/3 + lawn/5

= 8lawn/15

time = lawn/(8lawn/15) = 15/8 or 1.875 hrs = 1 hour and about 53 minutes

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