The orbit of Halley's Comet about the Sun is a long thin ellipse. At its aphelion (point farthest from the Sun), the comet is 5.2 x 10^12 m from the Sun and moves having a speed of 13.0 km/s. Determine the comet's speed at its perihelion (closest approach to the Sun) where its distance from the Sun is around 8.2 x 10^10 m?