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According to Wikipedia:

  • In air, light travels at approximately 300,000 kilometres per second or 186,000 miles per second.
  • In dry air at 20 °C (68 °F), the speed of sound is 343 meters per second (1,125 ft/s). This equates to 1,236 kilometers per hour (768 mph), or about one kilometer in three seconds and about one mile in five seconds. At different temperatures and humidities, sound travels at different rates.
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15y ago

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