SOLUTION: Marcus and Tony work for Lombardo's Pipe and Concrete. Mr. Lombardo is preparing an estimate for a customer. He knows that Marcus lays a slab of concrete in 8 hours. Tony lays the

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Question 713486: Marcus and Tony work for Lombardo's Pipe and Concrete. Mr. Lombardo is preparing an estimate for a customer. He knows that Marcus lays a slab of concrete in 8 hours. Tony lays the same size slab in 2 hours. If both work on the job and the cost of labor is $45.00 per hour, decide what the labor estimate should be.
Answer by josgarithmetic(39629) About Me  (Show Source):
You can put this solution on YOUR website!
The rates of Marcus and Tony combine by addition when they work together. "Lay a slab of concrete" is 1 job. Treat the rates as the number of jobs per hour.

Marcus' rate is 1%2F8 jobs per hour.
Tony's rate is 1%2F2 jobs per hour.
Tony and Marcus at the same time, %281%2F8%2B1%2F2%29 jobs per hour. Call this rate, R.

The price for the 1 job is $45.00/hour.

Jobs*(1/jobsPerHour)*(dollarsPerHour)= dollars.
That would be units of
jobs*(hours/job)*(dollars/hours)=dollars. That would be how the units work.

Here would be how the numbers would work:
1%2A%281%2FR%29%2A45, the labor cost estimate.