water in a canal 30dm wide and 12dm deep is flowing with a velocity of 20km/hr. How much area will it irrigate in 30 min if 9cm of standing water is desired ?

width of the canal= 30 dm=300 cm

depth of the canal = 12 dm=120 cm

the velocity of the flow of the water in canal = 20km/hr= 20 × 1000 × 100 cm/hr

amount of water irrigated in 1 hour= 300 × 120 × 2000000  

amount of the water irrigated in 30 min =

the area irrigated by this water if 9 cm of standing water is desired,

therefore the area irrigated by this water if 9 cm of standing water is desired,

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