A, B two cities 560 km apart. 2 trains from both A and B two out of the city is relatively open, 3.5 hours after the encounter. A line of cars 85 km per hour, B the number of vehicle kilometers per hour, OK? (With equations)
Please use the new tutorial, Do not use the old curriculum. (Some people may not understand.) Means: Please use the new curriculum, do not use the old curriculum
甲、乙两城相距560千米。两列火车同时从甲、乙两城相对开出，3.5小时后相遇。甲车每小时行85千米，乙车每小时行多少千米？（用方程解）
Please use the new tutorial，Do not use the old curriculum。（有些人可能看不懂。）意思是：请用新课程，不要用老课程。