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Questions are based on the following data. Each of the 15 customers who arrived at a customer service desk between 9 A.M. and 10
Questions are based on the following data. Each of the 15 customers who arrived at a customer service desk between 9 A.M. and 10
admin
2019-10-11
81
问题
Questions are based on the following data.
Each of the 15 customers who arrived at a customer service desk between 9 A.M. and 10A.M. was served in order of arrival by one of two customer service representatives. Each representative served one customer at a time and finished with that customer before serving any other customers. The graph shows the waiting and service times, recorded to the nearest minute, for customers numbered 1 to 15.
Of customers 4, 6, 8, 9, and 10, which one was served by the customer service representative who served customer 1?
选项
A、customer 4
B、customer 6
C、customer 8
D、customer 9
E、customer 10
答案
E
解析
如图所示,黑色部分代表客人被服务的时段。观察发现1号客人还没结束的时候2号客人已经开始服务了,说明2号和1号不是同一个代表服务的。而3号服务开始的时间正好是1号服务结束的时间,又因为一共只有2个代表在服务,所以3号和1号是同一个代表服务的。以此类推,最终发现10号和1号应为同一人服务,故答案为E。
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