Below is an instruction that describes a task. Write a response that appropriately completes the request in Thai. Please answer in Thai.

### Instruction:
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?

### Response:
 จรวดที่สองบินไปยังความสูง 500*2=<<500*2=1000>>1000 ฟุต
ดังนั้นความสูงรวมคือ 500+1000=<<500+1000=1500>>1500 ฟุต