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Let the total capacity of the tank be 160 units Efficiency of pipe ‘A’ = 160/20 = 8 units/hour Efficiency of pipe ‘B’ = 160/32 = 5 units/hour Tank filled in 14 hours = 14 × 8 = 112 units Therefore, required time taken to fill the remaining tank = (160 – 112)/(8 – 5) = 16 hours Therefore, total time taken = 14 + 16 = 30 hours
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