Planet Mercury's closest (perihelion) distance to the sun is...?

wat

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Planet Mercury's closest (perihelion) distance to the sun is 4.6x10^10 m, and its farthest (aphelion) distance is 7.0x10^10 m. If the speed of Mercury around the sun at the farthest distance is Va, it's speed, Vp, at the closest distance would be?

I'm reviewing for a test and it'd be wonderful if somebody could guide me through this.
 
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