Explanation:

- Determine lines printed by the inkjet printer:

- The inkjet printer prints at 8 lines per second.

- It takes 6 minutes to print the document.

- Lines printed = 8 lines/second * 360 seconds = 2880 lines.

- Calculate LED printer's speed:

- LED printer prints 7 lines/second more than the inkjet printer.

- Speed = 8 lines/second + 7 lines/second = 15 lines/second.

- Calculate time for LED printer:

- Time = Total lines / Speed = 2880 lines / 15 lines/second = 192 seconds.

- Convert to minutes: 192 seconds = 3 minutes and 12 seconds.

- Highlight the correct answer:

- Options provided:

1. 2 min 54 sec

2. 2 min 50 sec

3. 3 min 12 sec

4. 3 min 4 sec

- Option 3: 3 min 12 sec is the correct choice.

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