Charla wants to cover a certain rectangular area of her driveway with a picture using chalk. If she completes 2/3 of the area in 1/2 hour, how long will it take her to complete the entire picture?

If Charla completes 2/3 of the area in 1/2 hour, then it takes her 1/2 / (2/3) = 1/2 * 3/2 = <<1/2/(2/3)=3/4>>3/4 of an hour to complete the entire picture.