Question 684344
D=RT
700=[(X+40)+X]*5
700=[2X+40]*5
700=10X+200
10X=700-200
10X=500
X=500/10
X=50 MPH FOR THE SLOWER CAR.
50+40=90 MPH FOR THE FASTER CAR.
PROOF;
700=(50+90)5
700=140*5
700=700