Answer :
descent time: 4.25 min
hover time: 12.75 min
19.125 - 4.25-12.75 = 2.125 min
So, the ascent rate was (-28.9 - (-79.9))ft/2.125min = 24.0 ft/min
hover time: 12.75 min
19.125 - 4.25-12.75 = 2.125 min
So, the ascent rate was (-28.9 - (-79.9))ft/2.125min = 24.0 ft/min