to get to school, Da'Quon walks 0.60.60, point, 6 miles from his house to the bus stop. He then takes the bus for 3.93.93, point, 9 miles. After he gets off the bus, he can choose one of several walking routes to school. The total number of miles he travels, via walking and bus, does not exceed 5.45.45, point, 4. What is the greatest possible number of miles he walks after getting off the bus? Answers to choose from: 0.0, 0.3, 0.9, 15 which is the answer?