Light travels at a speed of approximately 186,282 miles per second in a vacuum. To calculate the time it takes for light to travel 100 miles, you can use the formula: time = distance/speed. Thus, it takes light about 0.000536 seconds, or 536 microseconds, to travel 100 miles.
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Light will travel 1 miles in about 5.368 microseconds (That means that light will travel about 65,000 miles in the time it takes the average person to blink!)
approx. 805,000 years
73 / A = hours of travel time
it depends how fast you travel. if you travel at 600 mph {miles per hour} it would take you 1 hour