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A and B leave from AB and meet 450 meters away from A. when they return, they meet 200 meters away from B
450×3-200
=1350-200
=1150M
A and B set out from a and B at the same time and meet at 200 meters away from B. after arriving at each other, they immediately return and meet at 100 meters away from B. how many meters are there between a and B?
（200×3+100）÷2
=700÷2
=350 meters
A and B are 350 meters apart
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