Question

please give me solution my school teacher said that it is incorrect bt I am sure that it is not incorrect so please help to solve this problem​

Answer 1

Answer:

Velocity of water=20Km/h

Water in the canal forms a cuboid of breadth = 12dm= $\frac{12}{10}$ m=1.2m

Height = 30dm=   30/10m=3m

Length = Distance covered by water in 30 minutes

           = Velocity of water × time

        =20000×30/60  =10000 m

Therefore,

Volume of water flown in 30 min = lbh=(1.2×3×10000)=36000 m  ^3

Suppose area irrigated be A m^2

Then,

A×  9/100 = Volume flown in 30 minutes

A×9/100 =36000

A=400000 m ^2

 

Hence, area irrigated =400000 m^2

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Answer 2

Answer:

Velocity of water=20Km/h

Water in the canal forms a cuboid of breadth = 12dm=

12/10

m=1.2m

Height = 30dm=

30/10

m=3m

Length = Distance covered by water in 30 minutes

= Velocity of water × time

=20000×

30/60

=10000 m

Therefore,

Volume of water flown in 30 min = lbh=(1.2×3×10000)=36000 m

3

Suppose area irrigated be A m

2

. Then,

A×

100

9

= Volume flown in 30 minutes

A×

100

9

=36000

A=400000 m

2

Hence, area irrigated =400000 m

2