A police car is chasing a speeding Porsche 911. Assume that the Porsche's maximum speed is 80.0m/s and the police car's is 54.0 m/s. At the moment both cars reach their maximum speed, what frequency will the Porsche driver hear if the frequency of the police car's siren is 440 Hz? Take the speed of sound in air to be 340 m/s.