If we start counting 72 hours from Saturday at 9:00 am, we can determine the exact day and time by performing the calculation.
Since there are 24 hours in a day, 72 hours is equivalent to 3 days (72 hours / 24 hours per day = 3 days).
Starting from Saturday at 9:00 am and adding 3 days, we arrive at Tuesday. However, to determine the exact time, we need to consider the time elapsed beyond the 3-day mark.
9:00 am on Saturday + 72 hours = 9:00 am on Tuesday.
Therefore, exactly 72 hours from Saturday at 9:00 am would be Tuesday at 9:00 am.