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A, B and c run around the 300 meter playground. A runs 120 meters per minute, B runs 100 meters per minute, C runs 70 meters per minute. How many minutes will the three meet?
（120+100+70）/300
Zhang Cong of the seventh grade winter vacation homework people's education press accidentally knocked over the ink bottle, so that only the following words could be seen in an assignment: "a and B are 450 kilometers apart
Follow up questions
Zhang Cong accidentally knocked over the ink bottle, so that only the following words could be seen in an assignment: "a and B are 450 km apart. The speed of the motorcycle is 45 km / h, and the speed of the car is 35 km / h. how long will it take for the two cars to meet each other at the same time?"
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