Question

Philadelphia is 2147 miles from salt city, Utah 2868 miles from Portland Oregon. What is the difference in round trip distances between Philadelphia and each of the other two cities?

Answer 1

Philly to Salt Lake City is 2,147 miles.
Salt Lake City to Portland is 2,868 miles.

Now I'm not sure if the answer you're looking for is in addition because you've left out the distance from Portland to Philadelphia, but all you have to do is add 2,147 and 2,868.

2,147 + 2,868 = 5,015