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

### Instruction:
 娜迪亚走了18公里，比汉娜走的路程多两倍。两个女孩总共走了多少公里？


### Response:
 18公里 = 2 * 9公里 = <<18=18>>18公里
两个女孩总共走了9公里 + 18公里 = <<9+18=27>>27公里。