* Gravity is a force, not a thing that travels. It's a fundamental force of attraction between objects with mass.
* The effects of gravity travel at the speed of light. When a massive object moves, the change in its gravitational field propagates outward at the speed of light. This means that if the Sun suddenly disappeared, we wouldn't feel the effects of its absence for about 8 minutes (the time it takes light from the Sun to reach Earth).
* Gravity doesn't "pull" anything. It's more accurate to say that objects with mass curve spacetime, and this curvature is what we perceive as gravity.
So, there's no single "gravity speed." The speed of gravity is effectively the speed of light, which is about 299,792,458 meters per second.
