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

### Instruction:
As Dan is learning to screen-print t-shirts to sell at the craft fair, he makes t-shirts, over the first hour, at the rate of one every 12 minutes. Then, in the second hour, he makes one at the rate of every 6 minutes. How many t-shirts does he make over the course of those two hours?

### Response:
 เขาทำได้ 60/12=<<60/12=5>>5 ในชั่วโมงแรก
เขาทำได้ 60/6=<<60/6=10>>10 ในชั่วโมงที่สอง
เขาทำได้ทั้งหมด 10+5=<<10+5=15>>15