The equation for this isf=(c/c+v) f0, where

fis the observed frequency (pitch) of the sound, in Hertz

cis the speed of sound, about 761 miles per hour,

vis the speed of the sound source, in this case the car, in miles per hour

f₀is the frequency of the sound when stationary

Using a spectrum analyzer, we could determine the observed frequency when the car was driving away was 240 Hz and the stationary frequency was 253 Hz.

Use this information and the equation to estimate the speed of the car in miles/hour, to 1 decimal place.

??? mi/hr