Hello, the correct answer is that the dog ended up in front of the two brothers' houses. The explanation is as follows: the two brothers are 5 kilometers apart and their speed is known, so the sum of their total speed is 5 kilometers per hour, so the meeting time is 1 hour. Before they met, the dog at home kept running back and forth at a speed of 5 kilometers per hour, which means that the dog kept moving without stopping, so the total distance the dog walked was 5* 1=5 kilometers. At this time, as soon as the two brothers met, the puppy stopped. It is easy to know from the question that the place where the two brothers met was at home! Nobel cooperation team, anxious people are anxious, solve people's worries, I hope you will adopt.