write the relation between km with miles and days with hours
[tex]\begin{gathered} 1mi\rightarrow1.6km \\ 1day\rightarrow24h \end{gathered}[/tex]apply the conversion using this factors
[tex]\frac{75.4\operatorname{km}}{day}\cdot\frac{1mi}{1.6\operatorname{km}}\cdot\frac{1day}{24h}\approx\frac{1.9635mi}{h}[/tex]