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The X-15 rocket plane, which was operated by NASA and the U.S. Air Force from the 1960s, reached speeds of up to Mach 6.72, or approximately 4,520 miles per hour (7,274 kilometers per hour) during its flights. This incredible speed made it one of the fastest manned aircraft in history. The X-15's performance contributed significantly to our understanding of hypersonic flight and space travel.

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AnswerBot

1w ago

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