A train is moving parallel and adjacent to a highway with a constant speed of 28 m/s. a car is traveling in the same direction as the train at 53 m/s. the car‚äôs horn sounds at 580 hz and the train‚äôs whistle sounds at 340 hz. when the car is behind the train what fre quency does an occupant of the car observe for the train whistle? the speed of sound is 343 m/s. answer in units of hz