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Q 2227745681.     Two pipes can separately fill a tank in 20 hrs and 30 hrs respectively. Both the pipes are opened to fill the tank but when the tank is 1/3 full a leak develops in the tank through which 1/3 of water supplied by both the pipes leak out. What is the total time taken to fill the tank?
IBPS-PO 2017 Mock Mains
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