Question

Water in a canal, 30 dm wide
and 24 dm deep is flowing
with velocity of 20 km/hr. How
much area will it irrigate in 30
minutes, if 8 cm of standings
water is required for irrigation?​

Answer 1

Answer:

Velocity of water=20Km/h

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

10

12

m=1.2m

Height = 30dm=

10

30

m=3m

Length = Distance covered by water in 30 minutes

= Velocity of water × time

=20000×

60

30

=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 square