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Pipe P can fill and empty tank in 4 hours but pipe Q can completely empty the same tank in 8 hours. But the pipes were opened...

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Question: 
Pipe P can fill and empty tank in 4 hours but pipe Q can completely empty the same tank in 8 hours. But the pipes were opened alternately after every two hours starting with pipe P then in how many hours, the tank was completely filled ?
Answer: 
10 hours
5 hours
6 hours
6 hours
10 hours
Last Updated: 
09/11/2021 - 20:08

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