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相遇问题—四年级
一辆公共汽车和一辆小轿车同时从相距 450 千米的两地相向而行，公共汽车每小时行 40 千米，小轿车每小时行 50 千米，问几小时后两车相距 90 千米？
四年级秒思数学38/97
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