Two? cars, 400 kilometers? apart, begin driving toward each other on a? long, straight highway. One car travels 105 kilometers per hour and the other 95 kilometers per hour. At the same? time, a? canary, starting on one? car, flies back and forth between the two cars as they approach each other. If the canary flies 140 kilometers per hour and spends no time to turn around at each? car, how far has it flown when the cars? collide?