# Avoiding in a circle

An ambulance car is going with a speed of $$60~\mbox{km/h}$$, while a car is trying to go around it in a circle with a speed $$50~\mbox{km/h}$$. If the sound that ambulance car emits has a frequency of $$1~\mbox{kHz}$$, which frequency does the driver of the car hear in Hz when the ambulance car is in the center of the circle it makes, and the car makes an angle $$\theta = 30^\circ$$ with the direction of the car?

Details and assumptions

• Speed of sound in the air is $$c = 1235~\mbox{km/h}$$.
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