Answer:

Step-by-step explanation:
It does not matter for how long she was driving with the old speed if you only wanna know the new speed.
Answer: -39
Explanation:
I’ve shown my work in the picture below. Hope this helps! :)
X2-10+25=35
+10. +10
x2+25=45
-25 -25
x2=20
———
2
x=10
Tried my best