Question

urgent friends class 10 board solve this question ​

Answer 1

HEY MATE HERE'S YOUR ANSWER ;


Solution

Width of the canal = 30 dm = 300 cm = 3 m


Depth of the canal 12 cm = 120 cm = 1.2 m


It is given that the water is flowing with velocity 10 km/hr


Therefore Length of the water column formed is

1/2 hour = 5 km = 5000 m


Therefore volume of the water flowing in 1 hour
= Volume of the cuboid of length 5000 m,

width 3 m and depth 1.2 m


=> Volume of the water in half hour

= (5000*3*1.2) m^3

= 18000 m^3


Suppose x m^2 area is irrigated in 1/2 hour
x*8/100

= 18000

x = 1800000/8 

x = 225000 

Hence the canal irrigated 225000 m^2 area in 1/2 hours