Answer
$424 \text { km}$
Work Step by Step
Convert by multiplying $\dfrac{1.6 \text{ km}}{1 \text{ mi}}$ to obtain:
$\require{cancel}=265 \cancel{\text{ mi}}\cdot \dfrac{1.6 \text{ km}}{1 \cancel{\text{ mi}}}
\\=265 \cdot 1.6 \text{ km}
\\=424 \text { km}$