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Bunuel
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Vibhatu
In 30 min, athlete will travel 4km. Then Diagonal, d=4, then are of square= d^2/2= 8

What is wrong with it?? Bunuel

We are told that the athlete is riding his bicycle along the boundaries of a square field, so 4 km he rides, is not the length of the diagonal but rather the sum of the two sides of the square filed, making on side equal to 2 km and the area equal to 4 km.
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