一条船往返于甲、乙两港之间，由甲至乙是顺水行驶；由乙至甲是逆水行驶，已知船在静水中的速度为每小时8公里，平时逆行与顺行所用时间的比为2：1．某天恰逢暴雨．水流速度变为原来的2倍，这条船往返共用9小时，那么甲乙两港相距多少公里？
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= 2.3÷0.3=
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= 2.4×0.5= 0.9÷0.03=
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= 4505÷5= 24.3﹣8.87﹣0.13= ．
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