How long will a man take(in minutes) to walk round the boundary of a square field containing $9$ hectares at $6$ km an hour?

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Solution

Area of the square field
$= 9$ hectares
$= 90000 m^{2}$
$∴$ Side of the square $\sqrt{90000} = 300 m$
Perimeter $4 \times 300 m = 1200 m$
$T i m e = \frac{D i s t a n c e}{s p e e d} = \frac{1200 \times 60}{6000}$ minutes
$= 12$ minutes

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