Camilla and Aisha are sisters and go to the same school. This morning, Camilla decided to bike to school, and Aisha decided to walk. They left home at the same time. Camilla’s speed was 6.5 miles per hour, and Aisha’s speed was 2 mph. When Camilla reached the school, Aisha was 1.5 miles behind. How far away from their house is the school?