Question

standard International unit of speed is m/s

Answer 1

here is your answer...

Speed and velocity are both measured using the same units. The SI unit of distance and displacement is the meter. The SI unit of time is the second. The SI unit of speed and velocity is the ratio of two — the meter per second.
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Answer 2

What do you want to know?
Yes. Unit of speed in SI system that is system international de unites and mks system is m/sec. What is your question? Are you just cinforming?
If yes, you are right.