Orbital speed

A stable circular orbit at a smaller radius has a greater orbital speed than one at a larger radius around the same body. Closer in, gravity pulls more strongly, so the object must travel faster to maintain that circular path. Further out, gravity is weaker and the speed for a stable circular orbit is lower.

The lower satellite is closer to Earth, where Earth's gravitational pull is stronger. It can therefore follow a tighter circular path at a higher orbital speed. The more distant satellite experiences a weaker pull and has a lower orbital speed in its stable circular orbit.