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OpenStudy (anonymous):

A yellow car passes a red car on the highway. From the yellow car's perspective, the red car is moving backward at a speed of 12 km/h. If the red car is moving at 75 km/h relative to the ground, what is the ground speed of the yellow car?

OpenStudy (anonymous):

Since the red car seems to be moving backwards, the yellow car is moving in the same direction of the red car. Just do 12 km/h + 75 km/h = 87 km/h

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