Can you check my answer to see if i really get this word problem thing

A camper leaves the campsite walking due east at a rate of 3.5 mph. Another camper leaves the campsite at the same time but travels due west. In two hours the campers will be 15 miles apart. What is the walking rate of the second camper?

Camper 1: distance is 15, rate is 3.5mph, time is 2 hrs.

Camper 2: distance is 15, rate is x, time is 2 hrs.

r=15/2
r=3.5 mph