Hema takes a total of 9 hours 55 min to walk a certain distance and then cycling back to the same place from where she had started. She could walk both ways in 12 hours 30 min. The time she will take to cycle both ways is :

• A. 7 hrs 20 min
• B. 7 hrs 15 min
• C. 7 hrs 35 min
• D. 7 hrs 40 min