题目

阅读短文，回答问题。Hello, I'm Tom. Mike is my brother and Lucy is my sister. I likewatermelons very much. I don't like apples. But my brother and my sister likeapples. They don't like oranges. My mother is Miss White. She likesstrawberries. My father likes grapes. （1） Do youlike oranges, Lucy? （2） Do youlike strawberries, Miss White? （3） Wholikes watermelons?如图，甲船以每小时海里的速度向正北方航行，乙船按固定方向匀速直线航行，当甲船位于处时，乙船位于甲船的北偏西方向的处，此时两船相距海里，当甲船航行分钟到达处时，乙船航行到甲船的北偏西方向的处，此时两船相距海里，问乙船每小时航行多少海里？