A tap can fill a tank in 4 hours. After half the tank is filled, three taps that are more similar are opened. What is the total time taken to fill the tank completely?
A. 1.5 hr
B. 3 hr
C. 2.5 hr
D. 2 hr
সঠিক উত্তরঃ
C.
2.5 hr
Explanation:
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