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Mathematics 10 Online
OpenStudy (anonymous):

Sarah is driving her car very smoothly from Austin to Dallas one day. At 6:00 pm she is travelling at 20 mph, while 25 minutes later she is travelling at 40 mph. Calculus tells us that at some time between 6:00 pm and and 6:25 pm her acceleration is exactly x mph/h. Determine x.

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