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** Q 2365167965. ** There are 3 inlet pipes X, Y and Z connected to a tank. If only one pipe is opened at a time, then it takes 50, 40 and 25 minutes for pipes X, Y and Z respectively to fill the tank. Find the time taken to fill 99% of the tank if it is known that in every 5 minutes for the first 2 minutes Pipe Y is opened and then closed for 3 minutes, the remaining pipes are always kept open.

**IBPS-PO 2017 Mock Mains **