根据规划设计，某市工程队准备在开发区修建一条长300米的盲道．铺设了60米后，由于采用新的施工方式，实际每天修建盲道的长度比原计划增加10米，结果共用了8天完成任务，则该-八年级数学

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• 甲、乙两地之间铁路长2400km，经技术改造后，列车实现了提速，提速后比提速前速度增加20km/h，列车从甲地到乙地行驶时间减少4h，已知列车在现有条件下安全行驶的速度不超过1-八年级数学
• 节日期间，文具店的一种笔记本8折优惠出售，某同学发现，同样花12元钱购买这种笔记本，节日期间正好可比节日前多买一本，这种笔记本节日期间每本的售价是多少元？-九年级数学
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