Astronomy question, need help please?

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ali_ed2001

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The Andromeda galaxy lies about 2.5 million light-years away. To what distances do the angular resolutions of SST (3″), HST (0.05″), and a radio interferometer (0.001″) correspond at that distance? answer in LIGHT YEARS.

now i know that 2.5 light years is 2.3651321 × 10^13

I just can't figure out how to get the answer in light years in the end for all 3 of them...can anyone help please..
 
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