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小学奥数，火车行程问题
春游时学生队伍排成180米的长队通过一座长720米的大桥,生活老师为了照顾好同学们,从队伍开始上桥时出发,骑自行车从队头到队尾,再从队尾到队头,再从队头到队尾…当队伍完全通过大桥时生活老师才停下。已知学生队伍每分钟行60米,生活老师骑车每分钟行300米。生活老师骑车一共行了多少米
小学数学，奥数60/87
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