Asteroids don't have a single, universal speed. Their speeds vary greatly depending on several factors:

* Location: Asteroids in the asteroid belt between Mars and Jupiter have different speeds than those closer to the Sun or further out.

* Orbit: Each asteroid has its own orbit, and the speed changes throughout that orbit.

* Perturbations: The gravitational pull of planets can slightly alter an asteroid's speed.

Here's a general idea:

* Average speed in the asteroid belt: Around 17-25 km/s (about 38,000-56,000 mph)

* Near Earth Asteroids: Can reach speeds up to 30 km/s (about 67,000 mph)

Important Note: Some asteroids can be much faster or slower than these averages.