A man walks and rides back in 6 hours 15 minutes but walks both ways in 10 hours 45 minutes. How long to ride both ways?

A man walks and rides back in 6 hours 15 minutes but walks both ways in 10 hours 45 minutes. How long to ride both ways?
A: 4 hours 25 mins
B: 4 hours 45 mins
C: 4 hours 30 mins
D: None of these