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Mathematics, 20.08.2019 17:00 neather

Carol drives her daughter to school at an average rate of 30 miles per hour, but only goes an average rate of 20 miles per hour on the way home because of traffic. what is her average rate for the entire trip?
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the answer is not 25 mph, i know for a fact that you can't just add 30 and 20 and divide by 2.

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