An athlete's average running speed on Monday was 6 miles / h. Her average running speed on Thursday was 15 miles / h. She run 10 miles more on Thursday than on Monday. The time she spent on running was 16 min longer on Thursday than that on Monday. How much time did she spend running on Monday?
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A30 min
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B35 min
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C40 min
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D45 min
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E50 min
显示答案
正确答案: C