A small package is released from rest at A and moves along the skate wheel conveyor ABCD. The package has uniform accelertion of 4.8 m/s^2 as it moves down sections AB and CD, and its velocity is constant between B and C. If the velocity of the package at D is 7.2 m/s, determine (a) the distance d between C and D, (b) the time required for the package to reach D