The Baldwin family walked 4/5 of a mile in 4/9 of an hour. What is their unit rate in miles per hour? 1. four -ninths over four-fifths = four over nine mile per hour

2. four-fifths over four-ninths = one and four-fifths miles per hour

3. four-ninths over four-fifths = one and four-fifths miles per hour

4. four-fifths over four-ninths = four over nine mile per hour