Due to bad weather, it took 45 minutes longer for Coco to drive 300 miles than usual. Her driving speed was 20 miles/h slower than usual. What is her normal driving speed when the weather is mild?
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A60 mile/h
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B70 mile/h
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C80 mile/h
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D90 mile/h
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E100 mile/h
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正确答案: E