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** Q 2235545462. ** There are `3` pipes `P_1, P_2, P_3` attached to a tank. Each Pipe can be used to either fill or empty the tank and having its rate same in both operations. The Filling or emptying rate of these pipes are `3 : 4 : 5`. When pipe `P_1` and `P_2` is opened, it took `4` hr to fill the tank. In the 1st, 2nd and 3rd hours of operation the pipes `P_1, P_2, P_3` respectively used for emptying the tank, while the other two pipes are used as filling pipe. What approximate fraction of tank to be filled at the end of three hours?

**IBPS-PO 2017 Mock Mains **