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Easy Relativity question

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    Not sure how to do the first question. I know I have to calculate the speed. Is it d=vt or a different equation. I think I need to convert 21 years into seconds.
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    I know light year is distance, do I need to convert it into anything and Earth years (time) into anything? or is it ok to just substitute them in the equation?

    21 is twice 10.5, therefore it must travel at half of a light-year per year, which is half C, which is 1.5*10^8 ms^1.
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    For c i) I dont know which answer is right? -3.1 ly or 10.5 ly?*
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    Can someone help?
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