Question: A plumber and his assistant work together to replace the pipes in an old house. The plumber charges $50 an hour for his own labor

A plumber and his assistant work together to replace the pipes in an old house. The plumber charges $50 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 $2400. How long did the plumber and his assistant work on this job?

Please give 2 separate answers - 1 for assistant & 1 for plumber

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