Suppose a person travels at a rate of 7 ft/hr toward the foot of a street lamp pole 64 ft high. The height of the person is 5.4 ft. At what rate is the distance from the head of the person to the top of the street lamp changing when 84 ft from the bottom of the street lamp? Note: Round your answer to 4 decimal places. 0 -6 ft/hr 0 5.3965 ft/hr 0 5.7410 ft/hr O -0.1742 ft/hr 0 5.5680 ft/hr 0 none of the other answers 0 0 ft/hr 0 0.1742 ft/hr