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how to solve 40km->nm
 

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Riza1viz
[tex]40\km = ? \ nm \\\\1\ km= 10^{12} \ nm \\\\40 \cdot 10^{12}=4\cdot 10\cdot 10^{12}=4\cdot 10^{1+12}=4\cdot 10^{13}[/tex]