数学题：李叔叔从家骑车去横溪办事。他从家里骑车出发，用三十分钟时间行完了一半路程，这时，他加快了速度，每分钟比原来多行50米.又骑了20分钟后，他从路旁的里程标志牌上知道，必须再骑2千米才能赶到横溪，求李叔叔家到横溪之间的总路程。

数学题解答：

再算出总路程：300×30×2＝18000（米）＝18（千米）

答：李叔叔家到横溪之间的总路程是18千米。

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