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从A港出发顺流匀速驶向B港，行至某处，发现船上﹣救生圈不知何时落入水中，立刻原路返回，找到救生圈后，继续顺流驶向B港。从B港出发逆流匀速驶向A港。已知救生圈漂流的速度和水流速度相同；甲、在静水中的速度相同。甲、到A港的距离y 1 、y 2 （km）与行驶时间x（h）之间的函数图象如图所示。 （1）写出在逆流中行驶的速度。 （2）求在逆流中行驶的路程。 （3）求到A港的距离y 1 与行驶时间x之间的函数关系式。 （4）求救生圈落入水中时，到A港的距离．参考公式：流航行的速度=船在静水中航行的速度+水流速度，船逆流航行的速度=船在静水中航行的速度﹣水流速度。
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