According to the meaning of the question, A started at 8: 00 a.m. and walked eastward at a speed of 6KM per hour, and walked for two hours at 10: 00 a.m., that is, left12 km; ; B Leave in an hour and go north at a speed of 5 kilometers per hour. At 10: 00 in the morning, I walked for an hour, which is 5 kilometers. From this analysis, a sketch can be drawn, and the distance between Party A and Party B can be calculated by Pythagorean theorem.