Ambulance runs urgently on slope! Siren sounds

SOLVED: An ambulance siren sounds off with a frequency of 250 Hz as it approaches an intersection where you are standing as a spectator. You hear the siren with a frequency of 175 Hz. a) Assuming the speed of sound is 340 m/s, what is the speed of the ambulance? b) After the ambulance passes, you begin to walk at a pace of 2 m/s in the opposite direction as the ambulance. Assuming the speed of the ambulance stays the same, what is the new frequency you hear the siren at?

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