Mark O. answered 12/14/17
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Hi Bob,
Use d = ct, where d is the distance light travels in meters, c is the speed of light, and t is the time in seconds.
t = (4 hours)(3600 s/hour) = 14,400 s
d = (3.0 X 108 m/s)(14,400 s) = 4.32 X 1012 m