Question 59075
3150=3*X+3(X+30)
3150=3X+3X+90
6X=3150-90
6X=3060
X=3060/6
X=510 MPGH FOR THE SLOWER PLANE &
510+30=540 MPH FOR THE FASTER PLANE PROOF
3150=3+*510+3*540
3150=1530+1620
3150=3150