Przypomnijmy:  $1000\text{m}=1\text{km}$, a więc $1\text{m}=\frac{1}{1000}\text{km}=0,001\text{km}$   

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Jacek

$600\text{m}=\frac{600}{1000}\text{km}=\frac{6}{10}\text{km}=0,6\text{km}$  

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Krysia

$950\text{m}=\frac{950}{1000}\text{km}=\frac{95}{100}\text{km}=0,95\text{km}$  

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Adam

$1350\text{m}=1\frac{350}{1000}\text{km}=1\frac{35}{100}\text{km}=1,35\text{km}$  

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Iwona

$1423\text{m}=1\frac{423}{1000}\text{km}=1,423\text{km}$  

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Marek

$2045\text{m}=2\frac{45}{1000}\text{km}=2,045\text{km}$