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So, the answer seems pretty easy. The observer is a stationary point behind the car, and the source is moving away from the observer, which means frequency should decrease:

f = 60 (300+0)/(300+50) = 51.4 Hz

wavelength = 300/51.4 = 5.8

Is this logic correct?

However, the answer in the book states that the final frequency is 70 Hz, by this equation:

f = 60 (300+50)/(300+0) = 70 Hz

Which one is correct?