Astronomy Math Conversions?

uniquejames

New member
Good afternoon, everyone! I was wondering if anyone could help me figure out how to convert the following problems. I would like to see how they are done, so I can learn how. If you could please show your work, I'd be grateful! Here are the problems:

"Current space crafts need to launch at speeds at 11 km/s to escape gravitational pull. Calculate how fast that is in:

Km per hr

Miles per hr

Light years per year

How long would it take us to get to the nearest star (4 light years away from us) at that speed?"

Any advice/help would be appreciated. Thank you!
 
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