You stand on the curb waiting to cross a street. Suddenly you hear the sound of a horn from a car approaching you at a constant speed. You hear a frequency of 80 Hz. After the car passes by, you hear a frequency of 72. Hz. At what speed was the car traveling?
a) 17m/s c) 19m/s
b) 18 m/s d) 20 m/s
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