【OG24-66题】Al and Ben are drivers for SD Trucking Company. One snowy day, Ben left SD at 8:00 a.m. heading east and Al left SD at 11:00 a.m. heading west. At a particular time later that day, the dispatcher retrieved data from SD’s vehicle tracking system. The data showed that, up to that time, Al had averaged 40 miles per hour and Ben had averaged 20 miles per hour. It also showed that Al and Ben had driven a combined total of 240 miles. At what time did the dispatcher retrieve data from the vehicle tracking system?_mofa留学圈mofaGRE在线题库系统_GRE在线搜题_GRE题库解析_GRE真题机经_GRE课程_GRE培训机构

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Al and Ben are drivers for SD Trucking Company. One snowy day, Ben left SD at 8:00 a.m. heading east and Al left SD at 11:00 a.m. heading west. At a particular time later that day, the dispatcher retrieved data from SD’s vehicle tracking system. The data showed that, up to that time, Al had averaged 40 miles per hour and Ben had averaged 20 miles per hour. It also showed that Al and Ben had driven a combined total of 240 miles. At what time did the dispatcher retrieve data from the vehicle tracking system?

1:00 p.m. 2:00 p.m. 3:00 p.m. 5:00 p.m. 6:00 p.m.

正确答案： B

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考点
行程问题 知识点概述
涉及路程、速度和时间三者关系，公式为路程 = 速度×时间，常考查不同主体在不同时间出发的行程情况。解析
Ben 8 点出发，Al 11 点出发，Ben 先出发 3 小时，这 3 小时 Ben 行驶了\(20×3 = 60\)英里。之后两人共同行驶的路程为\(240 - 60 = 180\)英里，两人速度和为\(40 + 20 = 60\)英里/小时，所以共同行驶时间为\(180÷60 = 3\)小时。Al 11 点出发，经过 3 小时是下午 2 点。

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