Question

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Answer 1

Answer:

4,00,000 sq.m

Step-by-step explanation

Breadth of the canal is 30km.

Depth (Height) of the canal is 12km.

The speed of canal is 20 km/h.

Time is 30 min i...e 1/2 hour.

To find the length of the canal, we can use the formula of speed,

S= D/t

D= S X t

  = 20 x 1/2

  = 10 km

Length of the canal is 10 km.

Since the canal is cuboidal in shape, We can use the formula of volume of cuboid

Volume of the canal= l x b x h

                                  = 10 x 30 x 12

                                  =300 x 12

                                   = 3600 cubic.km

V. of the canal= 9/1000 x area of land irrigated

3600 = 9/1000 x Area

Area= 3600 x 1000/9

       = 400 x 1000

       = 4,00,000 sq.m

Hence proved.

Hope this answer helps....