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If Sally can paint a house in 4 hours, and John can paint the same house in 6 hours, how long will it take for the to pain the house together?

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asked by N
  1. In 24 hours, both of them can paint 6+4 houses, or 10 houses.
    So the combined rate is 10houses/24hrs, or one house per 2.4 hours.

  2. From the information I have they are saying it should be 2 hours and 24 minutes. Can you explain?

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