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6. Taps X, Y and Z can fill a cistern in 6 hours, 8 hours and 12 hours respectively. Tap O can empty the
cistern in 4 hours. The 4 taps X, Y and Z and O, are allowed to run for 3 hours, after which tap O is
closed. How long will it take for the 3 taps to fill the remaining cistern?
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soooooo much tough.........
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