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A plumber and his assistant work together to replace the pipes in an old house. The plumber charges $35 an hour for his own labor

A plumber and his assistant work together to replace the pipes in an old house. The plumber charges $35 an hour for his own labor and $20 an hour for his assistant's labor. The plumber works twice as long as his assistant on this job, and the labor charge on the final bill is $2700. How long did the plumber and his assistant work on this job?

plumber h
assistant h

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