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2008年安徽省中考数学试卷的最后一道压轴题是这样的:刚回营地的两个抢险分队又接到救灾命令:一分队立即出发赶往30千米外的A镇;二分队因疲劳可在营地休息a(0≤a≤3)小时再赶往A镇参加救灾.一分队出发后得知,唯一通往A镇的道路在离营地10千米处发生塌方,塌方处地形复杂,必须由一分队用1小时打通道路.已知一分队的行进速度为5千米/时,二分队的行进速度为(4+a)千米/时.
The final round of the mathematics test of the 2008 Anhui Provincial Entrance Examination was the following: The two emergency teams that had just returned to the camp received another disaster relief order: One team immediately set off to town A 30 km away; the second team could be fatigued due to fatigue. The camp rested for a (0 ≤ a ≤ 3) hours and then rushed to A town to participate in disaster relief. After departure, it was learned that the only road leading to A town collapsed 10 km away from the camp. The landform at the collapse site was complex and must be determined by A squadron took a one-hour journey to the channel. Knowing that one squad had a speed of 5 km/h, the second squad had a speed of (4+a) km/h.