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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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Jim S. | Physics (and math) are fun, reallyPhysics (and math) are fun, really
4.7 4.7 (186 lesson ratings) (186)
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.