Water in a canal, $8$ m wide and $6$ m deep, is flowing with a speed of $12$ km/hour. How much area will it irrigate in one hour, if $0.05$ m of standing water is required?

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Step 1: Distance covered by water in $1$ hr $= 12000$ m
Step 2: Volume of water flown in $1$ hr $= 8 	imes 6 	imes 12000 = 576000$ m$^3$
Step 3: Area of field $	imes 0.05 = 576000$
Step 4: Area of field $= \frac{576000}{0.05} = 1152 	imes 10^4$ m$^2$ or $11520000$ m$^2$

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