Here's why:

* X-rays are electromagnetic radiation. This means they are a form of light, just like visible light, infrared, and ultraviolet.

* Electromagnetic radiation travels at the speed of light. This speed is approximately 299,792,458 meters per second (186,282 miles per second).

* Sound travels through matter. It is a mechanical wave, meaning it requires a medium (like air, water, or solids) to travel. Sound travels much slower than light, depending on the medium.

Therefore, X-rays travel significantly faster than sound.