A siren mounted on a tower, emits a sound frequency of 2140 Hz. A person is driving a car away from the tower at a speed of 27.0m/s. The sound reaches the person by two paths: the sound reflected from a building from of the car, and the sound coming directly from the siren. The speed of sound is 343 m/s. What frequency does the person hear the a) reflected and b) direct sounds? c) What is the beat frequency the person hears?