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 hours 20 min

B

7 hours 15 min

C

7 hours 35 min

D

7 hours 45 min