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A pedestrian waiting for the light to change at an intersection hears a car approaching with...

A pedestrian waiting for the light to change at an intersection hears a car approaching with its horn blaring. The car's horn produces sound with a frequency of 381 Hz, but the pedestrian hears a frequency of 387 Hz .

Part A

How fast is the car moving?

Express your answer to three significant figures and include the appropriate units.
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