Question

how to change metre per second into kilometre per second
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Answer 1

you have to divide it by 1000

Answer 2

FOR EXAMPLE :  If you want to convert the speed/velocity given in km/h into m/s then just multiply the value by 5/18 and get the answer.  So, 60×5/18 =16.67  The speed 60 km/h is equivalent to 16.67 m/s