we know there are 1000 meters in 1 kilometer, KILO=1000.
so, how many in 3/4 km?
[tex]\bf \begin{array}{ccll}
meter&km\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
1000&1\\\\
m&\frac{3}{4}
\end{array}\implies \cfrac{1000}{m}=\cfrac{1}{\frac{3}{4}}\implies \cfrac{1000}{m}=\cfrac{\frac{1}{1}}{\frac{3}{4}}\implies \cfrac{1000}{m}=\cfrac{1}{1}\cdot \cfrac{4}{3}
\\\\\\
\cfrac{1000}{m}=\cfrac{4}{3}\implies \cfrac{1000\cdot 3}{4}=m[/tex]
