The best way to describe speed is

a

how the time is multiplied by the temperature

b

the time it takes to go a distance

c

time traved over a certain distance traved

d

the change in position

e

distance covered in a certain amount of time

Fast. adjective. able to move quickly.

quick. adjective. able to move fast or do something fast.

swift. adjective. moving quickly.

speedy. adjective. happening very quickly.

nimble. adjective. able to move quickly and easily.

brisk. adjective. moving or acting quickly.

high-speed. adjective ...

agile. adjective.