Courtney walked from her house to the beach at a constant speed of 4 kilometers per hour, and then walked from the beach to the park at a constant speed of 5 kilometers per house. The entire walk took 2 hours and the total distance Courtney walked was 8 kilometers. Let b be the number of hours it took Courtney to walk from her house to the beach, and p the number of hours it took her to walk from the beach to the park. Which system of equations represents the situation?