To convert kilometres per minute to miles per hour, we will multiply by 37.2823.
Mathematically,
[tex]1\frac{\operatorname{km}}{\min }=37.2823\frac{\text{miles}}{\text{hour}}[/tex]Therefore,
[tex]\begin{gathered} 15\frac{\operatorname{km}}{\min}=15\times37.2823\frac{miles}{\text{hour}} \\ 15\frac{\operatorname{km}}{\min}=559.2345\frac{\text{miles}}{\text{hour}}\approx559.23\frac{\text{miles}}{\text{hour}}(2\text{ decimal places)} \end{gathered}[/tex]Hence, the answer is
[tex]559.23\frac{\text{miles}}{\text{hour}}[/tex]