Standing on the sidewalk next to your parked vehicle you, Physics

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Standing on the sidewalk next to your parked vehicle you

Standing on the sidewalk next to your parked vehicle you hear the siren of an approaching ambulance. The transmitted frequency of the approaching ambulance is 1200 Hz but you hear a frequency of 1363 Hz. It is a very hot day with the air temperature at 100oF.

a. Estimate the velocity of sound in air?

b. Calculate the speed of the approaching ambulance?

in km/h

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