Charla wants to cover a certain rectangular area of her driveway with a picture using chalk. If she completes 23 of the area in 12 hour, how long will it take her to complete the entire picture?
Since she completes $\frac{23}{12}$ of the job in 1 hour, she completes $\frac{1}{\frac{23}{12}}=\frac{12}{23}$ of the job in 1 hour. The time it takes to complete the whole picture is $\frac{1}{\frac{12}{23}}=\boxed{\frac{23}{12}}$ hours.
