Answer:
2/3 
Explanation:
I'm going to answer this assuming that Paige mows 
1
6
 of an acre in 
1
4
 of an hour.
There are 4 quarters in a whole and so we can multiply by 4 to go from quarters of an hour to a full hour. We can do the same to see how many acres Paige mows per hour:
1
6
×
4
=
4
6
=
2
3
 of an acre per hour