Solution: An ambulance is traveling North at 54.3 m/s, approaching a car that is also traveling North at 33.6 m/s. The ambulance driver hears his siren at a frequency of 678 cycles/s. The velocity of sound is 343 m/s. At what frequency does the driver of the car hear the ambulance's siren?

An ambulance is traveling North at 54.3 m/s, approaching a car that is also traveling North at 33.6 m/s. The ambulance driver hears his siren at a frequency of 678 cycles/s. The velocity of sound is 343 m/s. At what frequency does the driver of the car hear the ambulance's siren?