Let the total capacity of the tank be 150 units Efficiency of pipe ‘A’ = 150/25 = 6 units/hour Efficiency of pipe ‘B’ = 150/30 = 5 units/hour Tank filled in 13 hours = 13 × 6 = 78 units Therefore, required time taken to fill the remaining tank = (150 – 78)/(6 – 5) = 72 hours Therefore, total time taken = 13 + 72 = 85 hours
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