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胖博士奥数课堂696期：20200207（六年级）行程问题视频讲解
在一条的公路上有A、B两地，甲骑自行车从A地到B地；乙骑自行车从B地到A地，到达A地后立即按原路返回。若A、B两地相距30千米，两人约好一起出发，途中走了40分钟时碰面，不停顿继续前进，结果两人同时到达B地。（1）求甲、乙两人的速度。（2）若两人之同保持的距离不超过3km时，能够用无线对讲机保持联系，求出甲、乙两人能够用无线对讲机保持联系的时间间隔
胖博士奥数课堂37/274
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