tolong bantu jawab yaaa

[tex] v_{1} = 90 km/jam[/tex]
[tex] t_{1} = 3 jam 20 menit = 3 \frac{1}{3} = \frac{10}{3} jam[/tex]
[tex]v_{2} = 80 km/jam[/tex]
[tex]\frac{t_{1}}{v_{2}} = \frac{t_{2}}{v_{1}} \\ \frac{ \frac{10}{3}}{80} = \frac{t_{2}}{90} \\ \frac{300}{80} = t_{2} \\ t_{2} = 4 \frac{1}{4} jam = 4 jam 15 menit[/tex]