1 . A tank has two leakages. The first leakage alone can empty the tank in 9 minutes and the second alone would have done it in 6 minutes. If water leaks out at a constant rate. how long does it take both the leakage together to empty the tank ?
- A. 3.6 min
- B. 3.1 min
- C. 3.5 min
- D. 4.0 min
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