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11. Two roads, named A and B, intersect each other at an angle of 60. Two cars, one on road A travelling at 40 km

11. Two roads, named A and B, intersect each other at an angle of 60. Two cars, one on road A travelling at 40 km h and the other on road B travelling at 50 km h, are approaching the intersection. At a certain moment, the two cars are both 2 km from the intersection. How fast is the distance between them changing

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