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Actual speed of a car

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A police officer w/a radar gun is parked 20 feet off of the highway. The radar gun reads 75 mph when the car is 100 feet from the police car (as measured along the highway). what is the actual speed of the car?

I'm not sure how to set up the problem. Will the actual speed be less than or greater than 75? What does the problem setup look like and what steps are involved in solving it?

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This shows how to find speed of a car in a given situation.

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Please see the attachment.

Please see the above figure. is the position where the police car ...

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