Please answer the following question by reasoning step-by-step.
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?

1500
The second rocket goes 500 * 2 = 1000 feet.

So the total height is 500 + 1000 = 1500 feet.

.

So, the final answer is 1500