Homework Help: Math

Posted by Luanne on Thursday, September 2, 2010 at 7:07pm.

A painter can paint a racquetball court in 8 hours. His assistant needs an additional 2 hours to paint the same court working by himself. How long will it take both of them working together to paint the court.

Math - Reiny, Thursday, September 2, 2010 at 7:10pm
painter's rate --> court/8
assistant's rate --> court/2

combined rate = court/8 + court/2 = 5court/8

time with combined rate = court/(5court/8)
=8/5 hours

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