Answers

2016-02-20T11:57:26+05:30
Width of canal = 30 dm = 300 cm = 0.3 km
depth of canal =12 dm = 120 cm = 0.12 km
distance covered by canal in  30 mins = 20 x 30/60= 10 km 
amount of water irrigated  in 30 mins = 3/1000 x 12 /1000 x 10 =0.00036 km2
area irrigated in 0.009 km of standing water = 0.00036 / 0.009 =36x1000/9 x100000 =  0.4 km2


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