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** Q 2325056861. ** Pipe 1 can fill a tank in 12 hours and pipe 2 can fill it in 15 hours separately. A third pipe 3 can empty it in 20 hours. Initially pipe 1 was opened, after one-hour pipe 2 was opened and then after one hour pipe 3 was opened. In how many hours the tank will be full?

**IBPS-PO 2017 Mock Mains **