Hi, I need help for part c, please!

Answer:
35 mph
Step-by-step explanation:
The answer should be the average speed it takes to drive, so you would find the average of the speed to go to A with the speed to go to B. You already have the two answers for part A and B, so you would add them, then divide them by 2. It would look like this:
[tex]\frac{30+40}{2} =\frac{70}{2} =35[/tex]
So it would be 35 mph