Two cars leave an intersection. One car travels north; the other east. When the car traveling north had gone 15 mi, the distance between the cars was 5 mi more than the distance traveled by the car heading east. How far had the eastbound car traveled?
The eastbound car went
Draw a diagram, letting
By pythagorean theorem (since the directions east and north make a right angle) we have:
Hence, the eastbound car has travelled
Hopefully this helps!