In SI units with dry air at 20°C (68°F), the speed of sound c is 343 meters per second (m/s). per hour (mi/h or mph), 12.79 miles per minute (mi/min), 0.2131 miles per second (mi/s), That is 0.343 kilometers per second (km/s), or 20.58 kilometers per minute (km/min).
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Answer:
343 meters per second
In SI units with dry air at 20°C (68°F), the speed of sound c is 343 meters per second (m/s). per hour (mi/h or mph), 12.79 miles per minute (mi/min), 0.2131 miles per second (mi/s), That is 0.343 kilometers per second (km/s), or 20.58 kilometers per minute (km/min).