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

### Instruction:
 Miriam spent 30 minutes doing laundry, 15 minutes cleaning the bathroom, a certain amount of time cleaning her room, and 40 minutes doing homework. If she spent a total of two hours on these tasks, how long, in minutes, did she spend cleaning her room?


### Response:
 一小时有60分钟，所以2小时是2*60 = <<2*60=120>>120分钟。
因此，她在这4个任务上花了120分钟。
从这个时间中，我们可以减去她在其他3个任务上花费的时间：120分钟 - 30分钟 - 15分钟 - 40分钟 = <<120-30-15-40=35>>35分钟。