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

### Instruction:
 卡拉需要在中午之前干洗80件衣物。如果她早上8点开始工作，她每小时需要清洗多少件衣物？


### Response:
 首先计算卡拉需要工作多少小时：12:00 - 8:00 = 4小时
然后将总衣物数量除以小时数，得出卡拉每小时需要清洗多少件衣物：80件 / 4小时 = <<80/4=20>>20件/小时