Firstly CONVERT 300 kilometre into metre i.e.300km=300×1000 =300000Also convert hour into seconds i.e.1hour=60×60 =3600Therefore SPEED in m/s=300000/3600 =3000/36 =83.34m/sHope this is UR answer .If it is PLZZZZ mark it as brainliest answer
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