A tank has two leakages. The first leakage alone can empty the tank in 9 min and the second alone would have done it in 6 min. If water leaks out at a constant rate , how long does it take both the leakage together to empty the tank?
A. 3 min
B. 3.5 min
C. 4 min
D. 3.6 min
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সঠিক উত্তরঃ
D.
3.6 min
Explanation:
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