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Answer : 4 3 hrs 45 min Explanation : Answer: D) 3 hrs 45 min Explanation: Time taken by one tap to fill half of the tank = 3 hrs.Part filled by the taps in 1 hour = 4 x 1/6 = 2/3Remaining part = 1 - 1/2 = 1/22/3 : 1/2 :: 1 : pp = 1/2 x 1 x 3/2 = 3/4 hrs. i.e., 45 minSo, total time taken = 3 hrs 45 min.

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