Millet is grown in the Sahel because it is one of the main staples of the people there. Also, when grown with cowpea and sorghum, the risk of complete crop failure is greatly reduce
Answer:
It will take 720 minute to fill the tank
Explanation:
We have given that length of rectangular tank l = 12 m
Width w = 8 m
Rate at which water is filled in the tank = 550 l/min
And rate at which water come out from the tank = 150 l/min
So net rate of filling the tank = 550-150 = 400 l/min
Height up to which we have to fill the tank h = 3 meter
So volume of the tank 
We know that 
So 
So required time to fill the tank 
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The persian gulf because nearly 50% of the worlds oil reserves are found there