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Jet twice speed of sound

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smouse | 16:24 Mon 19th Dec 2005 | Quizzes & Puzzles
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Which country has, at a cost of ten million pounds, successfully tested a jet that travels at twice the speed of sound
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there was a documentary series recently called something like "race for speed", one episode was about the air speed record and I'm pretty sure it is held by the USA
Yes, but Concorde could travel at mach 2 and did so for many years.
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Thats why I dont understand the question I felt it was implying it was something new

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Jet twice speed of sound

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