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题1 李涛爬山游玩,上山时速度每小时2千米,到达山顶立即下山,下山时速度是每小时6千米,请你算一下,李涛的平均速度是每小时__千米。
Question 1 Li Tao climbs the mountain to play. When he goes uphill, the speed is 2 kilometers per hour. When he reaches the top of the hill, he immediately goes down. When he goes down, the speed is 6 kilometers per hour. Please count it. Li Tao’s average speed is __km per hour.