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It is the speed of light at miles per second.
Multiply miles per second by 3,600 to get miles per hour: 186,282 x 3,600 = 670,615,200 mph
It is 186282*1000/3600 = 51745 ms-1
Light travels at 186000 miles per second in vacuum.
At 20o Celsius, at sea level, the speed of sound is approximately 767 miles per hour.