Charla wants to cover a certain rectangular area of her driveway with a picture using chalk.
If she completes ⅗ of the area in
1/2
hour, how long will it take her to complete the entire
picture?
If Charla completes 3/5 of the area in 1/2 hour, it means that 1/5 of the area takes 1/2 hour as well because 3/5 - 2/5 = 1/5.
Since 1/5 of the area takes 1/2 hour, it means that the whole picture will take 5 * (1/2) = <<5*(1/2)=2.5>>2.5 hours. Answer: \boxed{2.5}.