Question 88947
BOTH CARS TRAVEL FOR 1.5 HOURS. THERE SPEEDS ARE X & (X+20). THEIR TOTAL DISTANCE IS 168 MILES THUS WE HAVE THE FOLLOWING FORMULA:
1.5X+1.5(X+20)=168
1.5X+1.5X+30=168
3X=168-30
3X=138
X=138/3
X=46 MPH FOR THE SLOWER DRIVER.
46+20=66 MPH FOR THE FASTER DRIVER.
PROOF
1.5*46+1.5*66=168
69+99=168
168=168