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Light takes about 5.5 hours to reach Pluto from .

If you know the time that light takes to reach certain object, you can deduce the distance to that object using the following formula.

$z = c * t$

z is the distance.
c is the speed of light.
t is the time that light takes to reach certain object.

so,

t = 5.5 hours = 5.5 x 60 x 60 = 19,800 seconds.

$ z = c * t $

$ z = 3$ x $10^8 * 19800$

$ z = 5.94$ x $10^12 $ m or 5.94 Billion km.

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