Mathematics, 08.06.2021 18:30, Ellafrederick

A plumber and his assistant work together to replace the pipes in an old house. The plumber charges $30 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 $2000. How long did the plumber and his assistant work on this job

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A plumber and his assistant work together to replace the pipes in an old house. The plumber charges...