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A truck left city A for city B at 8.30 a.m. at an average speed of 25 km/h.
At the same time, a jeep left city B for city A at an average speed of 40 km/h.
30 minutes after noon, the distance between the two vehicles was 240 km.
If the 2 vehicles had not passed each other, calculate the distance between city A and city B.