Creatively image a question and justification for this answer: 1500
The question is: John builds a model rocket that can travel 500 ft in the air. He builds a second rocket that can travel twice as high. What is the combined height of the two rockets?
Step-by-step reasoning process: The second rocket goes 500 * 2 = 1000 feet. So the total height is 500 + 1000 = 1500 feet.