As fast or as slow as the author of the story decides.
They Are So Slow
Fast Zombies with Guns - 2009 was released on: USA: 9 January 2009 (Gurnee, Illinois)
The zombie was as brainless as a baby
Zombies are mythological creatures and, as such, do not exist.
zombies aren't real, but in case your asking about in games, it's not fast, i guess
Yaks or Armored Zombies.
Could it be "Kids" by MGMT?
The Zombies are neither slow or fast.
you just have to keep playing solo
Chose any guns but as long as you aim for the zombies head. As you can see gun bullets are so strong and can fly so fast it can really kill zombies much faster.
you get carrots in minecraft from baby zombies on chickens or spiders, you have to kill them and then you will get them.