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

### Instruction:
 一列火车在3小时内行驶了360英里。以相同的速度，要行驶额外的240英里需要多少小时？


### Response:
 速度是360/3=<<360/3=120>>120英里/小时。
那么行驶额外的240英里需要240/120=<<240/120=2>>2小时。