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小学奥数，火车行程问题
某列火车通过250米长隧道用了25秒;通过210米长的隧道用了23秒。该列车与另一列长 320米,每秒行驶18米的列车在两股平行铁道上相对开过需要多少秒?
小学数学，奥数58/87
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