The Halley’s comet that passes around the Sun every 76 years consists of an elliptical orbit. If closest to the Sun (that is, perihelion) it is at a distance of 8.823 x10^10 and moves having a speed of 54.6 km/s. The greatest distance among Halley's Comet and the Sun (aphelion) is 6.152 x 10^12
Compute the speed at aphelion.