河宽300米,当船头垂直河岸航行时,到达对岸下游180米.现要使船达到正对岸,用时多长时间?
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![河宽300米,当船头垂直河岸航行时,到达对岸下游180米.现要使船达到正对岸,用时多长时间?](/uploads/image/z/11677071-39-1.jpg?t=%E6%B2%B3%E5%AE%BD300%E7%B1%B3%2C%E5%BD%93%E8%88%B9%E5%A4%B4%E5%9E%82%E7%9B%B4%E6%B2%B3%E5%B2%B8%E8%88%AA%E8%A1%8C%E6%97%B6%2C%E5%88%B0%E8%BE%BE%E5%AF%B9%E5%B2%B8%E4%B8%8B%E6%B8%B8180%E7%B1%B3.%E7%8E%B0%E8%A6%81%E4%BD%BF%E8%88%B9%E8%BE%BE%E5%88%B0%E6%AD%A3%E5%AF%B9%E5%B2%B8%2C%E7%94%A8%E6%97%B6%E5%A4%9A%E9%95%BF%E6%97%B6%E9%97%B4%3F)
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