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You are on a county road driving at a speed of 28 m/s when you hear...

You are on a county road driving at a speed of 28 m/s when you hear the siren of an oncoming fire engine. As the fire engine approaches you, you hear the frequency of its siren as 2830 Hz, but once it has passed you the frequency becomes 1860 Hz. What is the speed of the fire engine? The speed of sound in air is 343 m/s.

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