Eric traveled to three cities on a single highway. the distance from his original location to the first city was 100 miles more than the distance from the first city to the second city. the distance from the second city to the third city was 10 miles less than the distance from the first city to the second city. if the distance from his original location to the first city and the distance from the second city to the third city were the same, what was the total distance eric traveled?
a. 120 miles
b. 200 miles
c. 280 miles
d. 360 miles
e. 400 miles