10
6. at 48 feet above the ground level. john steps onto an escalator that ac.
a constant rate of 3 feet per second. john's distance from the ground is given by
d = 48 - 3n, where d is the distance from the ground in feet, and n is the # 01
seconds he has been on the elevator.
a) in how many seconds after john steps onto the escalator will he be 24 feet from
the ground?
b) how long will it take john to reach the ground level.