Emma: seventy-five hundredths of a mile
Charles: seven and five tenths of a mile
Distance: 0.75 miles
Emma: 75/100 miles
Emma: 0.75 miles, correct as this is the correct distance from the park
Charles: 7 and 5/10 miles
Charles: 7+ 0.5=7.5 miles, incorrect as this is far more than the distance to the park