Saltwater Crocodiles are bloody fast on land and even faster in the water. They can also disappear in the blink of an eye. Their top running speed is around 12km an hour.. humans may be able to run faster but crocodiles are more explosive and have a reaction speed 37times faster than ours, so running fast and early is a good survival strategy. However, in the water you don’t stand a chance (pun intended) Salties can reach speeds of 29km an hour in the water in short bursts, and are much more at