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October 21, 2014

October 21, 2014

Posted by **Jay** on Monday, July 13, 2009 at 3:41pm.

- Math -
**Marth**, Monday, July 13, 2009 at 3:51pmStephanie cleans at the rate of 1 pools/hr.

Mark cleans at the rate of 1/1.5, or 2/3 pools/hr.

Their combined rate is 5/3 pools/hr

If r is the rate, t is time, and p is the number of pools, then

r = p/t

(5/3pools/hr) = (1 pool)/t

t = 3/5hr

t = 60*3/5 = 36min

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