area of a square field is 35721m².a man is walking along its boundary at a speed of 12km/hr.in how much time will he complete four rounds along the boundary?
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Area=35721m™2
ie, side™2 =35721
Side=189m
Perimeter =4x189
=756m
Total distance =756x4
=3024m
Speed=distance /time
time=distance /speed
=3024/10/3[12km/hr=10/3m/s]
=100.8sec
=1.68min
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