let h represent the # of minutes that Hannah travels and r the # of minutes that Raoul travels. Then h + r = 63 min. We are told that h=6r.
Then 6r + r = 63 min, so:
7r = 63 min, and r=63 min / 7 = 9 min.
Raoul travels for 9 minutes and Hannah travels for 6(9 minutes) = 54 minutes.