Răspuns :
75 km/h.........6 h
90 km/h.........x h
Sunt invers proportionale
[tex] x=\frac{75*6}{90}=\frac{450}{90}=5~h [/tex]
90 km/h.........x h
Sunt invers proportionale
[tex] x=\frac{75*6}{90}=\frac{450}{90}=5~h [/tex]
[tex]v_1=75\:km/h,\:\:t_1=6\:h[/tex]
[tex]v_2 = 90\:km/h[/tex]
[tex]v = \frac{d}{t}\implies t_2 = \frac{d}{v_2}[/tex]
[tex]t_2=\frac{v_1\cdot t_1}{v_2}[/tex]
[tex]t_2=\frac{75\:km/h\cdot 6h}{90\:km/h}[/tex]
[tex]t_2=\frac{450\:km}{90\:km/h}[/tex]
[tex]t_2=5h[/tex]
[tex]v_2 = 90\:km/h[/tex]
[tex]v = \frac{d}{t}\implies t_2 = \frac{d}{v_2}[/tex]
[tex]t_2=\frac{v_1\cdot t_1}{v_2}[/tex]
[tex]t_2=\frac{75\:km/h\cdot 6h}{90\:km/h}[/tex]
[tex]t_2=\frac{450\:km}{90\:km/h}[/tex]
[tex]t_2=5h[/tex]