Verify your answer to part A by calculating the average speed.
To find average speed we need to find how much time this trip took since
22 m/s=.014 miles/s so the first 10 miles of the trip took 714.3 s. In the second leg we have .016 miles/s so this took 625 s.
Total trip was 20 miles which is 32187 m so
Average Speed=32187/714.3+625=24.03 m/s which is less than 25 m/s