Suppose a 101-ft ladder is leaning against a wall. If the bottom is pulled away from the wall at a rate of 1 ft/sec, at what rate is the top of the ladder sliding down the wall when the bottom is 20 ft from the wall? O 15 The top of the ladder is sliding down the wall at the rate of 5 ft/sec. 7 The top of the ladder is sliding down the wall at the rate of 33 ft/sec. 20 The top of the ladder is sliding down the wall at the rate of 99 ft/sec. 10 The top of the ladder is sliding down the wall at the rate of 51 ft/sec. The top of the ladder is sliding down the wall at the rate of 20 101 ft/sec.