As Paige mows 1/6 acres in 1/4 hours. To find how much she is able to mow in an hour, you will have to multiply this by 4. You only need to multiply the numerator in the fraction, as otherwise, you will just get the same answer that you already have, but in a different version. Therefore 1/6 multiplied by 4 is 4/6, which can also be simplified to 2/3.
Therefore, Paige is able to mow 2/3 acres in one hour.
Hope this helps :)