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Basics of Pipe and Cistern - 1 (in Hindi)
There is an empty reservoir whose capacity is 30 ltr. There is an inlet pipe which fills at 5L/min and an outlet pipe which empty at 4L/min.Both the pipes function alternatevely for 1 min. assuming that the inlet pipe is the first one to function , how much time will it take for the reservoir to be filled up to its capacity?