Do you like Sun Wukong? He is one of the most popular novel characters in Chinese history. Not only young children but also adults love him so much. In our mind, he is a great hero in the Chinese novel Journey to the West.

    In the novel, Sun Wukong, Zhu Bajie and Sha Seng beat demons(妖魔) and protect Tang Seng when they travel to the Western Paradise(西天). Sun Wukong was born from a stone. He can change himself into a tree, a bird, or and animal. With one somersault(筋斗), he can travel 108,000li.

    Sun Wukong is clever, brave and always makes fun magic tricks. Chinese people love him very much.

    Sun Wukong is also popular in other countries. Many western children love him and learn kung fu because of him. To them, he is a super hero, just like Superman and Spiderman.

已知命题$p:\forall x\in R,\cos x\le 1$，则$\neg p$是（   ）

如图，小岛在港口P的北偏西60°方向，距港口56海里的A处，货船从港口P出发，沿北偏东45°方向匀速驶离港口P，4小时后货船在小岛的正东方向．求货船的航行速度．（精确到0.1海里/时，参考数据： $\sqrt{2}$ ≈1.41， $\sqrt{3}$ ≈1.73）