Two automobiles left simultaneously from cities a and b heading towards each other and met in 5 hours. the speed of the automobile that left city a was 10 km/hour less than the speed of the other automobile. if the first automobile had left city a 4.5 hours earlier than the other automobile left city b, then the two would have met 150 km away from b. find the distance between a and b. the answer is not 1600 !