A tap can fill a tank in 6 hours. After half the tank is filled , three more similar taps are opened . What is the total time taken to fill the tank completely?
A. 3 hrs 15 min
B. 3 hrs 45 min
C. 4 hrs 15 min
D. None of these
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সঠিক উত্তরঃ
B.
3 hrs 45 min
Explanation:
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