Question 1009207
Call her original speed, r.
The time she drove was t.
rt = 10
During the second leg, her rate was r + 10 and her time was 3/4 - t.
Here (r + 10)(3/4 - t) = 25
The solving of this takes quite a while and too many steps for this place, but it turns out that 
t = 1/4 hour and
r = 40 mph