Cleaner runs 225 km in a day

A street cleaner completed running Chengdu's outer ring road in Sichuan province, covering a total of 225 kilometers within 25 and a half hours. Chen Xuejun, 47, a keen amateur runner, said he was inspired by a Beijing man who ran 122km around Beijing's Fifth Ring Road in 14 hours on his birthday in July.

How many hours did it take Chen to finish 225km in Chengdu?

A. 24 and a half hours

B. 25 and a half hours

C. 26 and a half hours