[tex]32.4\frac{km}{h}[/tex]
This problem can be solved by using unit conversion. The trutle swimming at [tex]9\frac{m}{s}[/tex], to calculate its speed in [tex]\frac{km}{h}[/tex]:
We have to convert meter to kilometer, and second to hour as follow:
[tex]9\frac{m}{s}*\frac{1km}{1000m}*\frac{3600s}{1h}\\9*\frac{3600km}{1000h}\\32.4\frac{km}{h}[/tex]