21 feet by 21 feet is a square having an area of 441 square feet.
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21 feet is 252 inches
840 feet/40 seconds = 21 feet per second.840 feet/40 seconds = 21 feet per second.840 feet/40 seconds = 21 feet per second.840 feet/40 seconds = 21 feet per second.
There are 3 feet in one yard. Therefore, 21 feet is equal to 21 / 3 = 7 yards.
3 feet are in a yard. Multiply 21 by 3 and there is your answer.
21 feet x 24 feet = 504 square feet = 46.82 square meters.