Pipes & Cisterns · Question 17 · Easy
Pipes & Cisterns question 17
Two outlet pipes can empty a full tank in 6 hours and 12 hours respectively. If both are opened on the full tank, how long will it take to empty it?
- 4 hours
- 9 hours
- 6 hours
- 3 hours
Answer and explanation
Answer: A. 4 hours
Explanation: Together they empty 1/6 + 1/12 = 3/12 = 1/4 of the tank per hour, so the tank empties in 4 hours.
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