You are driving down a road with a speed of 12.7 m/s. An ambulance, 0n the other side of the road and driving in the opposite direction as you are (toward you), and is moving at a speed of 35 m/s. The ambulance siren is at a frequency of 840 Hz. As the ambulance is approaching your car, what frequency would you hear? Use speed of sound equal to 343 m/s