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Doppler effect: Frequency the car horns emit when one is at rest and the other moving

Two automobiles are equipped with the same single frequency horn. When one is at rest and the other is moving toward an observer at 15.9m/s, a beat frequency of 5.60Hz is heard. What is the frequency the horns emit? Assume T= 20 degrees celsuis

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Step 1.
When two sounds which differ slightly in frequency are received simultaneously, an observer hears the 'beat note' which is their difference. Let f be the frequency received from the stationary horn, and f' the frequency received ...

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