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Question: a bird is about 65 in long with a thin...

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A bird is about 6.5 in.​ long, with a​ thin, dark bill and a​ wide, white wing stripe. If the bird can fly 20 mi with the wind in the same time it can fly 10 mi against the wind when the wind speed is 5 ​mph, what is the speed of the bird in still​ air?

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