Question 1126573
This has been asked and answered several times.
Let's move on.
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There's no need to set up a proportion.
Multiply the 2 numbers.
Notice the seconds cancel, leaving the inches.
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A light-year us commonly used as the distance light travels in a year.
A light-foot is sometimes used (not my many) as the time for light to travel a foot. It's 1 nanosecond.
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---> 1 nanosecond = ~ 1 light-foot