Question 119778
3/4X+3/4(X+4)=117
3/4X+3/4X+3=117
1.5X=117-3
1.5X=114
X=114/1.5
X=76 KM/H IS THE SPEED OF THE NORTH BOUND CAR.
76+4=80 KM/H IS THE SPEED OF THE SOUTH BOUND CAR.
PROOF
3/4^76+3/4*80=117
57+60=117
117=117