一条船相对以 1 4 km/h 的速度逆流而上。水流相对于地面的速度是 9km/h ,以水流方向为正方向,船相对于地面的速度为 km/h . 若一个孩子在船上以速度 6km/h 从船头走向船尾,同样 以水流方向为正方向 则他相对于地面的速度为 km/h .
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