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Supersonic speed is a rate of travel of an object that exceeds the speed of sound. An object traveling in dry air at a temperature of 68-degrees F, at sea level, reaches supersonic speed at 768-miles per hour. Since the retirement of the Concorde, there are no supersonic passenger aircraft left in service. The speed of sound decreases somewhat with altitude, due to lower temperatures found there.

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Q: What speed is supersonic?
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