An algebra problem by Interliser 727
Car A and car B are driving from N to M. Car A drives at 5km/h at the first one third of the road, then it drives at 4.5km/h at the second one third of the road and drives at 4km/h at the last part of the road. And then car B drives at 5km/h at the first half of the road and then slows down to 4km/hat the last part of the road. It is given that car A arrives earlier than car B by 30 seconds, ask the distance of N to M.
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