Answer:
7.5 acres per hour
Step-by-step explanation:
1) You know that in 1/3 of an hour John waters 2 1/2, or 2.5, acres of farmland.
2) To get 1 hour we would multiply what John waters in 1/3 of an hour by 3.
2.5acres * 3 = 7.5 acres per hour
3) We multiply by 3 because 1/3 of an hour * 3 = 1 hour
so: 2.5acres * 3 = 7.5 acres per hour
