[tex]v=72\frac{km}{h}=72\cdot\frac{1000m}{3600s}=20\frac{m}{s}[/tex]
a) [tex]\Delta t = 10s[/tex]
[tex]D=v\cdot\Delta t=20\frac{m}{s}\cdot 10s=\boxed{200m}[/tex]
b) [tex]D=25\:km[/tex]
[tex]\Delta t=\frac{D}{v}=\frac{25\:km}{72 \frac{km}{h}}=\frac{25}{72}h=\frac{25}{72}\cdot 3600s=\\=\boxed{1250s}[/tex]
