GMAT Problem Solving
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Source: Manhattan
Level: 3
A call center responds to telephone inquiries between the hours of 9 am and 12 pm. Including the idle time, on average, it takes 1.5 minutes to answer an inquiry between 9 and 10 in the morning, 4.5 minutes between 10 and 11, and 5 minutes between 11 and 12. What is the fraction of total inquiries answered between 9 and 12 that the call center, on average, responds to between 9 and 10 in the morning?
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