Q9 of 76 Page 18

Water in a canal 30 dm wide and 12 dm deep, is flowing with a velocity of 100 km per hour. How much area will it irrigate in 30 minutes if 8 cm of standing water is desired?

Given,


Width of canal = 30 dm = 3m


Depth of canal = 12 dm = 1.2 m


Velocity of flow = 100 km/h


Length of cuboid thus formed = distance travelled by water in 30 minute at speed 100km/h


=


Volume of water = 50000×3×1.2 m3


Water accumulated in field forms a cuboid of base area equals to area of field and height =


= hence , area of field =


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