SOLUTION: johnny can do a job in 6 hours. jeffrey can do the same job in 9 hours. how long would it take them to do the job together?

Question 863871: johnny can do a job in 6 hours. jeffrey can do the same job in 9 hours. how long would it take them to do the job together?
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!



Hi

Let x represent time together

    |Multiplying thru by 18x so as all denominators = 1

 3x  + 2x = 18

    5x = 18

     x = 3.6 hrs    

 

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