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题甲、乙两车同时由A地开往B地,甲车在前一半路程中的速度为v1,后一半路程中的速度为v2(v1≠v2),乙车在前一半时间内的速度是v1,后一半时间内的速度是v2,问哪辆车先到达终点?请加以证明.
Both A and B vehicles are traveling from A to B at the same time. The speed of the A-car in the first half is v1, and the speed in the second half is v2 (v1≠v2). The speed of the second car in the first half It is v1. In the second half of the time, the speed is v2. Which vehicle should reach the end first? Please prove it.