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A tank is full of water . A drain pipe which can empty a tank in 60 minutes is opened . 18 minutes later another pipe which can fill the empty tank in 30 minutes is opened . After how much time is the tank is full again ?( in minutes)

Answer» A tank is full of water . A drain pipe which can empty a tank in 60 minutes is opened . 18 minutes later another pipe which can fill the empty tank in 30 minutes is opened . After how much time is the tank is full again ?( in minutes)


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