Stars

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Two of the nearest stars to Earth are Sirius (8.7 light years away) and Wolf (7.7 light years away). Sirius is moving towards us at 8km/s and Wolf is moving away at 13km/s. When Wolf had travelled one light year, what will be the nearest star to Earth?

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So... Nobody got the last riddle XD
I've decided that I won't post the answers until someone gets them, hope y'all don't mind :p

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