prima jumatate de drum:
d/2= v1×t1
a doua jumatate de drum
d/2= v2×t2
Avem v1=2×v2, deci si t2=2×t1
Prin urmare: d/2=2×v2×t1
Viteza medie:
d=vm×(t1+t2)=vm×(t1+2×t1)=3×vm×t1
Egalind:
4×v2×t1=3×vm×t1
Deci v2=3×vm/4
v1=2×v2=3×vm/2
Numeric:
v1=48×3/2=72km/h
v2=36km/h
