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light travels at about 300 million meters per second. multiply this by the number of feet per meter (a bit more than 3). now, divide 4 by this answer.

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Light travels at a speed of approximately 186,282 miles per second (or 983,571,056 feet per second). In 4 feet, light would take about 4.07 microseconds (millionths of a second) to travel from one end to the other.

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9mo ago
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Q: How long does it take light to travel in 4 feet?
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