Final answer:
On ECG paper, one minute is represented by 300 large boxes and a 6-second duration is represented by 30 large boxes. This is calculated based on the understanding that each small box on ECG paper represents 0.04 seconds and five small boxes make up one large box.
Step-by-step explanation:
On ECG paper, one minute is represented by 300 large boxes, as each large box consists of 5 small boxes, and each small box represents 0.04 seconds. Therefore, 5 small boxes (one large box) account for 0.2 seconds, and since there are 60 seconds in a minute, 60 divided by 0.2 equals 300 large boxes. For a 6-second interval, you would count the number of large boxes across 6 seconds on the ECG strip, typically equating to 30 large boxes as 6 seconds is one-tenth of a minute (6 sec = 1 minute / 10).