Pipe A can fill a tank in 6 hours and Pipe B can empty it in 12 hours. How long will it take to fill the tank if both are open?

A8 hours

B10 hours

C12 hours

D18 hours

Explanation

Net work rate per hour = 1/6 – 1/12 = 1/12. Time required = 12 hours.

Exam Relevance

Topic: Age Problems, Time & Distance, Work
Subtopic: Pipes & Cisterns

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