The question, as stated, cannot be answered sensibly. A square foot is a measure of area, with dimensions [L2]. A yard is a measure of distance, with dimensions [L]. The two measure different things and basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.
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Every yard is equal to 3 feet. 260 x 3 = 780. 260 yards = 780 feet.
9 sq feet = 1 sq yard so 780 sq ft = 780/9 = 86.66... sq yards.
one (half acre) = 21 780 square foot
21 780 sq feet To a greater accuracy than scientifically reasonable Given that only one significant figure is in the question a proper answer would be: 2 * 105 square feet
There are 780/60 = 13 minutes