Halley's comet travels in an elongated elliptic orbit for which, the minimum distance...

Halley's comet travels in an elongated elliptic orbit for which, the minimum distance from the sun in approximately  where rE = 92 .9 × 106 mi is the mean distance from the sun to the earth. Knowing that the periodic time of Halley's comet is about 76 years, determine the maximum distance from the sun reached by the comet.