Pipes & Cisterns · Question 19 · Easy
Pipes & Cisterns question 19
Pipe A fills 1/5 of a tank every hour, while pipe B empties 1/8 of the tank every hour. If both are opened on an empty tank, how long will it take to fill it?
- 12 hours 30 minutes
- 40 hours
- 13 hours 20 minutes
- 13 hours
Answer and explanation
Answer: C. 13 hours 20 minutes
Explanation: Net filling per hour = 1/5 − 1/8 = 3/40. Time = 40/3 hours = 13 1/3 hours = 13 hours 20 minutes.
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