Question 184911
D=RT
THE DISTANCES ARE THE SAME THUS:
RT=RT
(X+25)5=(X-25)5.5
5X+125=5.5X-137.5
5X-5.5X=-137.5-125
-.5X=-262.5
X=-262.5/-.5
X=525 MPH IS THE PLANE SPEED IN STILL AIR.