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Two trains, each having a speed of s, are headed at each other on the same straight track. A bird that can fly at speed 2sflies off the front of one train when they are d apart and heads directly for the other train. On reaching the other train it flies directly back to the first train, and so forth. (We have no idea why a bird would behave in this way.) In terms of variables given in the problem, what is the total distance the bird travels?

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