The speed of a train is \[20\,m\,{{s}^{-1}}.\]What is t – McqOptions

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1.	The speed of a train is \[20\,m\,{{s}^{-1}}.\]What is the speed in km\[km\,{{h}^{-1}}?\]
A.	\[60\text{ }km\text{ }{{h}^{-1}}\]
B.	\[40\text{ }km\text{ }{{h}^{-1}}\]
C.	\[~72\text{ }km\text{ }{{h}^{-1}}\]
D.	\[20\text{ }km\text{ }{{h}^{-1}}\]
Answer» D. \[20\text{ }km\text{ }{{h}^{-1}}\]

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