Exams › IBPS PO › Quantitative Aptitude

Pipe A fills tank in 6 hours. With a leak, it takes 9 hours. In how many hours can the leak alone empty the full tank?

1. Invalid OCR
2. 20
3. Invalid OCR
4. 18

Correct answer: 18

Solution

A fills at rate 1/6 per hour. With leak: 1/9 per hour. Leak rate = 1/6 - 1/9 = (3-2)/18 = 1/18. Leak alone empties tank in 18 hours.

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