Final answer:
Julie must work for 1/12 of an hour to earn one dollar, which equates to 5 minutes of work.
Step-by-step explanation:
The student asked: To earn one dollar, how long does Julie have to work if she works 1/12 hours per dollar?
To answer this, we simply need to understand the given rate and apply it directly. Julie's work rate is 1/12 hours per dollar. This means for every dollar Julie earns, she works 1/12th of an hour. Therefore, to earn one dollar, Julie will have to work 1/12 of an hour. Since there are 60 minutes in an hour, we can multiply 1/12 by 60 to find out the number of minutes.
1/12 hour x 60 minutes/hour = 5 minutes
So, Julie must work 5 minutes to earn one dollar.