Odpowiedź :
s=v*t
s=65km/h*6h=390km
v=s/t
v=390km/6h-1h
v=78km/h
t=s/v
t=390km/50km/h
t=7,8h czyli 7h48min
s=65km/h*6h=390km
v=s/t
v=390km/6h-1h
v=78km/h
t=s/v
t=390km/50km/h
t=7,8h czyli 7h48min