How fast is the sedan?

In the above diagram, an ambulance moving at a constant speed of \(20 \text{ m/s}\) generates a sound of frequency \(1080 \text{ Hz}.\) Calvin is chasing the ambulance in his sedan at a constant speed. If the frequency of the sound measured by Calvin from his car is \(1050 \text{ Hz},\) then what is the speed of Calvin's sedan?

The speed of sound in the air is \(340 \text{ m/s}.\)

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