change of PE = g x mass x change of elevation = 9.81*62*(15 -3) Joules = 7298.64J

35% of this is lost

7298.64 * 0.35 = 2.554J or 2.6 kJ

65% of the lost PE ends up as increased KE.

The skier starts off 0.5 *62 * 1.5 * 1.5 J of KE = 69.75J and gains 7298.64*0.65 J = 4744.12J of KE

Thus she has a total of 4813.87J of KE.

This corresponds to a velocity of sqrt (4813.87/31) = 12.46 m/sc

Edit I see I cross posted with Chip.