The distance that an object travels per unit of time is called speed.

Here's a breakdown:

* Distance: How far an object moves.

* Time: How long it takes to move that distance.

* Speed: The rate at which an object covers distance over a period of time.

Formula:

Speed = Distance / Time

Units:

* Speed is typically measured in units like meters per second (m/s), kilometers per hour (km/h), or miles per hour (mph).