Question 48644
720/(X+30)+720/(X-30)=10 OR [720(X-30)+720(X+30)]/(X~2-900)=10 OR

(720X-21600+720X-21600)/(X~2-900)=10 OR 10(X~2-900)=1440X OR X~2-144X-900=0 OR

(X-150)(X+6)=0 OR X=150 & X=-6 THEREFORE THE SPEED OF THE PLANE IS 150MPH