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Answer:
1620000 m²
Step-by-step explanation:
Width of canal = 5.4 m
Depth of canal = 1.8 m
Speed = 25 km/hr.
Time = 40 minutes = (40/60) = (2/3) hr.
=> (2/3) * 25 km
=> (50/3) km
=> (50000/3) m.
Now,
Volume of water flowing in (2/3) hours :
=> (50000/3) * 5.4 * 1.8
=> 162000 m³
Standing water = 10 cm = 0.1 m.
This volume = base area of field * 0.1 m
Base area = volume/0.1
= 162000/0.1
= 1620000 m²
Therefore,
Irrigated area = 1620000 m²
Hope it helps!