Someone ran 6 miles/h for a while, then she rode at the speed of 15 miles/h. Her cycling time was 16 min longer than her running time. The distance of cycling was 10 miles longer than the distance of running. How long did she run?
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A20 min
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B24 min
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C40 min
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D56 min
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E60 min
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正确答案: C