Imagine a question and stream-of-consciousness explanation for which this is the answer: 39
Question: Emerson and his friends love rowing and don't miss the sport on weekends. Starting in the morning, Emerson rowed and was 6 miles away from his starting point on a particular weekend. He continued for another 15 miles at a constant speed, only stopping for a while for rest before covering the remaining 18 miles. What's the total distance covered by Emerson on his trip?
Stream-of-consciousness: After the first 6 miles, he rowed 15 miles more, reaching 6 + 15 = 21 miles. After resting, he adds 18 miles more, which is 18 + 21 = 39 miles.