



 
Hi Larry. I think something is missing from your question. Picture this: Car A is at position 0 feet, Car B is in front of Car A, at position 90 feet (so its front bumper is 90 feet ahead of the front bumper of car A). Car C is at position 180 ft (90 feet in front of Car B's front bumper). If Car D is just alongside Car A (about to pass it) at position 0 ft, and it passes Car C at position 200 ft, then it has covered 200 feet in the time it took Car C to go 20 feet, so D is going 10 times the speed However, If the cars are not so spread out, we get different results: Without knowing something else, like the time it takes to pass or the spacing of the three cars (I'm assuming of course that the cars are in singlefile!) there is no real answer to the question. Cheers,  


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