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A race car is traveling towards you and you hear a sound of frequency 4072 Hz...

A race car is traveling towards you and you hear a sound of frequency 4072 Hz while the car is traveling towards you. Then the car shoots by you and as the car is traveling away from you, you hear a frequency of 2774 Hz. The car is moving at a constant speed during the whole time you hear these two frequencies, what is the speed (in m/s) of the car

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