Question

name the physical quantity which tells us how fast an object moves

Answer 1

speed and velocity are the answers.
speed tells us how fast an object moves,
and velocity tells us speed with respect to a particular direction.

Answer 2

speed and velocity are the physical quantity which tells us how fast an object moves as speed tells us how fast the object is moving but it does not tell us the direction whereas velocity being a vector quantity tells us at what speed an object is travelling or traveled with particular direction...