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

### Instruction:
Bob was creating a math test for an online platform.  He created 13 questions in the first hour.  Bob then doubled his rate for the second hour, and doubled his second hour rate for the third hour.  How many questions did Bob create in the three hours?

### Response:
First hour: <<13=13>>13 questions
Second hour:13(2)=26 questions
Third hour:26(2)=52 questions
Total:13+26+52=<<13+26+52=91>>91 questions
#### 91