I don't know how to solve for the speed In problem 13 and 14.

013 10.0 points A street light is on top of a 8 foot pole. Joe, who is 4 feet tall, walks away from the pole at a rate of 4 feet per second. At what speed is the tip of Joe's shadow moving from the base of the pole when he is 14 feet from the pole? 1. tip speed - 7 ft/sec 2. tip speed - 5 ft/sec 3. tip speed # 6 ft/sec 4. tip speed - 4 ft/sec 5. tip speed - 8 ft/sec 014 10.0 points A street light is on top of a 15 foot pole. A person who is 5 feet tall walks away from the pole at a rate of 4 feet per second. At what speed is the length of the person's shadow growing? 21 1. speed ft/sec 10 23 2. speed 10 ft/ sec 12 3. speed ft/ sec 4. speed = 2 ft/sec 11 5. speed 5 ft/sec