Answer:
The correct answer is John Ross
The RAF had over 50 radar stations across Britain which could find out about future attacks before the German aircraft managed to reach the coasts of Britain. This enabled them to prepare counter-attacks and their defense and ultimately rendered the German airforce completely useless. This is why Germans never managed to conquer the island.
Divide 61.5 by three so you know how much each quarter is.
61.5/3=20.5
And then add that number to 61.5 so that you have all four quarters
20.5+61.5=82
So he only has 20.5 miles more to get home and he will have traveled 82 miles in all when he gets home.