The cheetah can reach around 70mph - it's the fastest running animal in the world. The leopard has a top speed of around 35mph - I don't know where people are getting 55mph but that is a wild exaggeration. Greyhounds can reach about 40mph.
The cheetah is the fastest land animal, achieving a top speed of about 70 mph (113 kph)
Leopard---- Top Speed 88.5 kph (55 mph)
a greyhound can reach a speed of 45 mph (72km/h)
Leopards : Probably 90 km/hr (= 56 miles/hr);
and how fast are greyhounds at top speed