Christopher can paint the interior of his house in 35 hours. if he hires cynthia to help him, they can do the same job together
in 25 hours. if he lets cynthia work alone, how long will it take her to paint the interior of his house? round you answer to 1 decimal place.
1 answer:
Christopher = 35 hours
Christopher and Cynthia = 25 hours
1/25 - 1/35 = 2/175
175/2 = 87.5 hours <==== Cynthia needs 87.5 hours to paint the house alone.
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