I believe the answer is 1.25 insulators per hour.

Hi , the answer is 4 hours because

12insulators-15hours

11-14hours

10-13hours

9-12hours

8-11hours

7-10hours

6-9hours

5-8hours

4-7hours

3-6hours

2-5hours

1-4hours

1. 25 ,divide 15 by 12

The time it takes to install 1 insulator would be 1.25 hours

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