9.-(15 Points) The figure shows two packages that start sliding down a 20° ramp d= 6.6 m from rest a distance along the ramp from the bottom. Package A has

a mass of5.0 kg and a coefficient of kinetic friction 0.20 between it and the ramp. Package B has amass of 10 kg and a coefficient of kinetic friction 0.15 between it and the ramp. How long does it take package A to reach the bottom?