Keerthana takes 9 hrs 20 min in walking a distance and riding back to same place where she started. She could walk both ways in 11 hrs 15 min. The time taken by her to ride back both ways is

• A. 7 hrs 25 min
• B. 7 hrs 35 min
• C. 7 hrs 45 min
• D. 7 hrs 15 min