The '500 km/hr' part is certainly an example of speed. Speed = Distance/Time.
The inclusion of a direction makes this an example of velocity.
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Divide speed by time. In this case, you get (kilometers / hour) / hour, or kilometers/hour2. That means, how much does the speed change in an hour.
10 kilometers per hour
It is a measurment of speed, and means that if the speed remains constant the object will travel 120 kilometers in one hour.
That is short for "kilometers per hour", also written as kilometers/hour, or km/h.
9km per hour