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son and dad clean the house in 3 hours. son takes an hour longer working alone. How long it takes him?

together they clean the house in 3 hours.  It takes the son an hour longer working by himself.  How long it takes him to clean alone?
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1 Answer

Hi Mariela,
 
      I think the answer is is already stated, it takes him 4 hours cleaning alone. Unless I'm not reading the problem correctly.
Jim