Frequency of Reflected Waves from Moving Truck: 0.0620 MHz

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A stationary motion detector sends sound waves of frequency 0.0620 MHz toward a truck approaching at a speed of 40.5 m/s. What is the frequency of the waves reflected back to the detector? (Take the speed of sound to be 343 m/s.)

Please provide a solution rather than just an answer :) I really appreciate any help!
 
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