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Answer : 3 300 hrs Explanation : Answer: C) 300 hrs Explanation: Volume of water collected in the tank in 1 hour⇒ (0.3 × 0.2 × 20km × 1000mts) = 1200 m cubicIf after t hours, the water is at height of 12m, 1200t=200×150×12 ⇒ t = 300 Hours.

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