A stationary motion detector sends sound waves of frequency, Physics

A stationary motion detector sends sound waves of frequency

Solve the following problem:

Problem: A stationary motion detector sends sound waves of frequency 500 Hz towards an approaching truck. If the frequency of the waves reflected back to the detector is 625 Hz,

Part A: What is the speed of the truck?

I need help to solve the above problem and take the speed of sound to be 343 m/s.

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Physics: A stationary motion detector sends sound waves of frequency

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Physics: A stationary motion detector sends sound waves of frequency

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