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趣味数学之火车过桥①：声音传播的时间也要算，火车的速度好求
本节的内容主要讲述的是小学趣味数学（多为思维训练的题目），可以尝试让孩子做一做，很有挑战意义；本节涉及的是火车过桥问题①：火车的速度是多少
小学趣味数学：奥数精炼，让孩子打开思维，爱上数学学习294/373
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