A jet aircraft flies over you in straight, level flight at a steady speed. The whine of the engine is audible to you. While the plane is approaching, you gauge the engine whine at 6596Hz. After it passes and is flying away from you, you gauge the whine at 4715 Hz. What are (A) the speed of the aircraft and (B) the rest frequency of the engine whine? Suppose the speed of sound is 343 m/s.