Comets move around the sun in very elliptical orbits. At its closest approach, in $1986,$ Comet Halley was $8\mathrm{.}79{10}^{7}km$ from the sun and moving with a speed of $54\mathrm{.}6k\frac{m}{s}.$

Part A

What was the comet's speed when it crossed Neptune's orbit in $2006?$ Express your answer with the appropriate units.

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