Pipes & Cisterns · Question 10 · Medium
Pipes & Cisterns question 10
An outlet can empty a full tank in 10 hours. If an inlet that lets in 6 litres per minute is also kept open, the full tank empties in 12 hours. What is the capacity of the tank?
- 7,200 litres
- 18,000 litres
- 43,200 litres
- 21,600 litres
Answer and explanation
Answer: D. 21,600 litres
Explanation: Inlet = 6 × 60 = 360 L/h. Capacity C satisfies C/10 − 360 = C/12, so C/60 = 360 and C = 21,600 litres.
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