Physics homework problem involving the doppler effect, please help!!?

Mary

New member
A speeder is pulling directly away and increasing his distance from a police car that is moving at 25 m/s with respect to the ground. The radar gun in the police car emits an electromagnetic wave with a frequency of 6.1 x 109 Hz. The wave reflects from the speeder's car and returns to the police car, where its frequency is measured to be 390 Hz less than the emitted frequency. Find the speeder's speed with respect to the ground.

~I know you have to solve for the relative speed, I just cant seem to get there with the sample problems they gave us. Im not getting anywhere and its really frustrating, please explain if you can!! Thank you!!
 
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