Gus, I hope I'm not too late!
We know that distance = rate x time, or d = rt. We have the total distance, 119 miles, and the time, 7 hours. If Victoria's rate stays as r, then Rachael's rate is r + 5, because she travelled 5 mph faster.
So, Victoria travelled 7r miles and Rachael travelled 7(r + 5) miles, right?
Together, they travelled 119 miles, so 7r + 7(r + 5) = 119
7r + 7r + 35 = 119
14r + 35 = 119
14r = 84
r = 6
So, Victoria travelled 6 mph and Rachael travelled 11 mph.
Hope this helps!
