Answer:
6.6×10^-7 light years
Step-by-step explanation:
You want the distance 6.2 million km converted to light years.
Light years
A million km is 10^9 meters, or 1 Gm.
A light year is 9460730.4725808 Gm. So, the number of light years in 6.2 Gm is ...
(6.2 Gm)/(9460730.4725808 Gm/ly) ≈ 6.5534×10^-7 ly
Keeping 2 significant figures, we have ...
6.2 million km ≈ 6.6×10^-7 light years
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Additional comment
That's roughly 20.7 light-seconds.