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

### Instruction:
Vivian is responsible for making sure her students get 2 15-minute recess breaks a day, a 30-minute lunch and another 20-minute recess break.  How much time do her students spend outside of class?

### Response:
 รวมเวลาที่ใช้นอกห้องเรียนทั้งหมดคือ 2 * 15 + 30 + 20 = <<2*15+30+20=80>>80 นาที