SOLUTION: Machine X can do a certain job in four hours and machine Y can do the same job in six hours if machines X, Y, and Z do the job in two hours working together, how long would it take

Question 1129774: Machine X can do a certain job in four hours and machine Y can do the same job in six hours if machines X, Y, and Z do the job in two hours working together, how long would it take Z to do the job alone?
Answer by josgarithmetic(39627) (Show Source): You can put this solution on YOUR website!
z, time for machine Z to do one job working alone, in hours

--------solve this for z.

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