None.
50 kilometres is a measure of distance. Metres per hour is a measure of speed or velocity. The two measure different things and it makes no sense to try and convert one to the other. The question is like asking how fast is the length of your room!
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Its average speed is 50 meters per 2 seconds. The rate can also be expressed as "25 meters per second", "90 kilometers per hour", or "approximately 56 miles per hour".
(50 m/sec) ÷ (1,000 m/km) x (3,600 sec/hr) = 180 km/hr
50 km/h is about 1,388.9 centimeters per second.
About 33 miles per hour.
Most cars can easily go at that speed. That's about 80 kilometers per hour.