Final answer:
To find the fraction of his shirt that Brian irons in 1 minute, we can first determine how much he irons in 1 hour and then convert it to minutes.
Step-by-step explanation:
To find the fraction of his shirt that Brian irons in 1 minute, we can first determine how much he irons in 1 hour and then convert it to minutes. Since Brian irons 2/9 of his shirt in 3 3/5 minutes, we can find out how much he irons in 1 hour by multiplying it by the reciprocal of 3 3/5 minutes (which is 5/3). So, in 1 hour, Brian irons 2/9 * 5/3 = 10/27 of his shirt. To find out how much he irons in 1 minute, we can divide 10/27 by 60 (since there are 60 minutes in an hour) to get the fraction of his shirt that Brian irons in 1 minute.
Therefore, the fraction of his shirt that Brian irons in 1 minute is 1/162.