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It would take: (220/100) times 9.2 = 20.24 seconds
An average human swims at 2 miles per hour, which converts to 3520 yards per hour. So unless you swim really, really slowly, it should take much less than one hour to swim 50 yards. In fact it should take a little less than one minute at average speed.
If you take the square root of 81, you get 9 square yards, which is the answer.
The time it takes to walk 100 yards depends on an individual's walking speed. On average, a person walks at a speed of about 3 to 4 miles per hour, which translates to roughly 1.33 to 1.78 yards per second. Therefore, walking 100 yards would typically take around 1.5 to 2 minutes.
250 feet = 250/12 yards = 2.833 yards it takes 100-2.833 yards