Situational Problem Solving involving Hyperbola 1

Two radio stations are located 150 miles apart, where station A is west of station B. Radio signals are being transmitted simultaneously by both stations, travelling at a rate of 0.2 miles/micro-sec. A plane travelling at 60 miles above ground level has just passed by station B and is headed towards the other station. If the signal from B arrives at the plane 480 micro-sec before the signal sent from A, determine the location of the plane. PreCalculus LM SHS pp. 59