甲、乙两镇分别在河的上、下游,A、B两船在两镇之间往返行驶.某天,两船同时从甲镇出发,A、B两船的静水速度是21千米每时和15千米每时,水流速度为3千米每时.如果A船由甲镇到乙镇需用t小时,
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![甲、乙两镇分别在河的上、下游,A、B两船在两镇之间往返行驶.某天,两船同时从甲镇出发,A、B两船的静水速度是21千米每时和15千米每时,水流速度为3千米每时.如果A船由甲镇到乙镇需用t小时,](/uploads/image/z/7118436-12-6.jpg?t=%E7%94%B2%E3%80%81%E4%B9%99%E4%B8%A4%E9%95%87%E5%88%86%E5%88%AB%E5%9C%A8%E6%B2%B3%E7%9A%84%E4%B8%8A%E3%80%81%E4%B8%8B%E6%B8%B8%2CA%E3%80%81B%E4%B8%A4%E8%88%B9%E5%9C%A8%E4%B8%A4%E9%95%87%E4%B9%8B%E9%97%B4%E5%BE%80%E8%BF%94%E8%A1%8C%E9%A9%B6.%E6%9F%90%E5%A4%A9%2C%E4%B8%A4%E8%88%B9%E5%90%8C%E6%97%B6%E4%BB%8E%E7%94%B2%E9%95%87%E5%87%BA%E5%8F%91%2CA%E3%80%81B%E4%B8%A4%E8%88%B9%E7%9A%84%E9%9D%99%E6%B0%B4%E9%80%9F%E5%BA%A6%E6%98%AF21%E5%8D%83%E7%B1%B3%E6%AF%8F%E6%97%B6%E5%92%8C15%E5%8D%83%E7%B1%B3%E6%AF%8F%E6%97%B6%2C%E6%B0%B4%E6%B5%81%E9%80%9F%E5%BA%A6%E4%B8%BA3%E5%8D%83%E7%B1%B3%E6%AF%8F%E6%97%B6.%E5%A6%82%E6%9E%9CA%E8%88%B9%E7%94%B1%E7%94%B2%E9%95%87%E5%88%B0%E4%B9%99%E9%95%87%E9%9C%80%E7%94%A8t%E5%B0%8F%E6%97%B6%2C)
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