Pipe A can fill a tank in 12 hours and pipe B can fill it in 15 hours, – InterviewSolution

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1.	Pipe A can fill a tank in 12 hours and pipe B can fill it in 15 hours, separately. A third pipe C can empty it in 20 hours. Initially pipe A was opened, after one hour pipe B was opened and then after 1 hour when pipe B was opened pipe C was also opened. In how many hours the tank will be full?
Answer» `9 2/3` HOURS `6 2/3` hours 10 hours none of these Answer :A

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