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Pipe A can fill an empty cistern in 15 hours while Pipe B takes 25 hours to fill it. Initially Pipe A is left open for some time and then closed and Pipe B is switched on immediately. In all the cistern rakes 21 hours to be filth How long was Pipe A open?

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selling an item for 440 rupees loss is 60% of the profit received on selling the same item in thousand rupees know the purchase price of that item