Correct Answer: Option B
Time taken by one tap to fill half of the tank = 3 hrs.
Part filled by the four taps in 1 hour = (4 x 1/6) = 2/3.
Remaining part = (1 – ½) = 1/2.
So, 2/3 : 1/2 :: 1 : x
=> x = (1/2 x 1 x 3/2)= 3/4 hours
i.e., 45 mins.
So, total time taken = 3 hrs. 45 mins.
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