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Two trains, each having a speed of 20 km/h, are headed at eachother on the same straight track. A bird that can fly 40 km/h fliesoff the front of one train when they are 40 km apart and headsdirectly for the other train. On reaching the other train it flies directly back to the first train, and so forth. (We have no ideawhy a bird would behave in this way.) What is the total distance (in km) the bird travels?

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