Meteors typically enter Earth's upper atmosphere at speeds ranging from 11 to 72 kilometers per second (km/s), which translates to 25,000 to 160,000 miles per hour (mph).

Here's a breakdown:

* Average Speed: The average speed of a meteor entering the atmosphere is around 40 km/s (90,000 mph).

* Fastest Recorded Speed: The fastest meteor ever recorded entered the atmosphere at 72 km/s (160,000 mph). This is about 17 times faster than a bullet fired from a rifle.

* Slowest Speed: The slowest meteors may enter the atmosphere at around 11 km/s (25,000 mph).

Factors influencing meteor speed:

* Origin: Meteors from the asteroid belt tend to be faster than those from cometary debris.

* Earth's Gravity: The Earth's gravitational pull accelerates meteors as they approach.

* Earth's Orbital Speed: The Earth's orbital speed around the Sun also influences the relative speed of a meteor entering the atmosphere.

Note: These speeds are for the initial entry into the atmosphere. As a meteor enters the atmosphere, it slows down due to friction and air resistance.