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The first big question and the third small question in the middle school entrance examination sample of China Normal University.
This problem is a comparative problem, because they travel at the same time when they meet, but at different speeds, so the speed determines the distance they walk, so the speed ratio is equal to their distance ratio. Because the distance from B to A and C is equal, let this distance be X, so Xiao Ming is X+ 150 when we meet for the first time, and Xiaoqiang is X- 150 when we meet for the second time. Xiaoming walked 3X+450 and Xiaoqiang walked X+450, so X+ 150/X-650.
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