A 6.00-ft-tall man walks at 5.00 ft/s toward a street light that is 16.0 ft above the ground. At what rate is the end of the man's shadow moving when he is 6.0 ft from the base of the light? Use the direction in which the distance from the street light increases as the positive direction. The end of the man's shadow is moving at a rate of (Round to two decimal places as needed.) ft/s.