Matt and Jaime are walking perpendicular to each other. Matt is moving east, while Jaime is moving south, both at the same speed of 1.25 miles per hour. Their paths create a right angle, and if we were to visualize their movements on a coordinate plane, Matt's movement would represent the positive x-axis (east) and Jaime's movement would represent the negative y-axis (south).
If you were to analyze their overall movement, we could say that they are both traveling away from a common starting point, with their paths diverging at a right angle.