Question 165944
5X+5(X+60)=2,800
5X+5X+300=2,800
10X=2,800-300
10X=2,500
X=2,500/10
X=250 MPH FOR THE SLOWER PLANE.
250=60=310 MPH FOR THE FASTER PLANE.
PROOF:
5*250+5*310=2,800
1,250+1,550=2,800
2,800=2,800