Answer:
Yes
Step-by-step explanation:
Yes, the question asks for an average not the rainfall on one specific day, therefore it is a statistical question.
(accidentally answered as a comment)
400/2 = 200
200 + 20 = 220
200 - 20 = 180
Answer: He had gone 220 miles.
He was 180 miles from the finish and 220 from the start, so he was 40 miles closer to the finish than to the start.