GMAT (Graduate Management Admission Test) Question:
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Two identical taps fill 2/5 of a tank in 20 minutes. When one of the taps goes dry in how many minutes will the remaining one tap fill the rest of the tank?

Answer:

1. 5 minutes
2. 10 minutes
3. 15 minutes
4. 20 minutes
5. None of the above

Ans : C

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