Răspuns:
7)
A.............B v=100km/h
d=v×t=>d=100km7h×6/h=600km
a)daca v=120km/h=>t=d/v=600km/120km/h=5h
b)daca t=8ore=>v=600km/8h=75km/h
c)daca t=10ore=>v=600km/10h=60km/h
8)4tractoare........ 180h
10tractoare.......x ore
X=4×180/10=72 ore
12 tractoare
X=4×180/12=60ore
20 tractoare
X=4×180/20=36ore
b)4tractoare...........180 ore
X tractoare.... 90 ore
X==4×180/90=8tractoare
18 ore
X=4×180/18=40 tractoare
10 ore
X=4×180/10=72 tractoare
