Question 130881
5(X+25)=5.5(X-25)
5X+125=5.5X-137.5
5X-5.5X=-137.5-125
-.5X=-262.5
X=-262.5/.5
X=525 ANSWER FOR THE SPEED OF THE PLANE IN STILL AIR.
PROOF:
5(525+25)=5.5(525-25) 
5*550=5.5*500
2750=2750