A man walking at 3 km/hr crosses a square field diagonally in 2 minutes . The area of the field in (m2) is.
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Length of diagonal = distance covered in 2 min
= 3600/60 * 2 = 100 m
Area of the field = 1/2 (diagonal)^2 = 1/2 * 100 * 100
= 5000 m^2 = 50 ares
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