Joe walked 4/9 of a mile in 4/5 of an hour. what is his unit rate in miles per hour? 4/9 over 4/5 = 5/9 mile per hour 4/5 over 4/9 = 1 and 4/5 miles per hour 4/9 over 4/5 = 1 and 4/5 miles per hour 4/5 over 4/9 = 5/9 mile per hour