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如图,在海岛A上有一座海拔1千米的山,山顶设有一个观察站P,上午11时,测得一轮船在岛北偏东30°,俯角为30°的B处,到11时10分又测得该船在岛北偏西60°,俯角为60°的C处.
(1)求船的航行速度是每小时多少千米?
(2)又经过一段时间后,船到达海岛的正西方向的D、处,问此时船距岛A有多远?
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