A shop is open 9 AM - 7 PM. The function r(t), graphed above, gives the rate at which customers arrive (in people/hour) at time t, where t measures time in hours since 9 AM. Suppose that the salespeople can serve customers at a rate of 75 people per hour. Answer the following questions:  C. How many people are in the line at the time when it's the longest? Answer: _________ people.  D. When does the line vanish? Answer: ________ hours after opening.

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