A cyclist rides twice around a track whose circumference is 50 km. The average speed of the first lap was 40 km/h, and the average speed of the second lap was 20 km/h. What's the average speed of his ride?
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A18.87 km/h
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B23.33 km/h
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C26.67 km/h
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D30 km/h
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E32 km/h
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正确答案: C