A 6 foot tall person walks away from a 12 foot tall lamppost at a constant rate of 3 feet per second. (a) What is the rate that the tip of the shadow moves away from the person when the person is 4 feet away from the pole? (b) What is the rate that the tip of the shadow moves away from the lamppost when the person is 4 feet away from the pole? ft/sec help (numbers) ft/sec help (numbers)