Time taken by pipe ‘A’ and pipe ‘B’, together to fill the tank = 5/0.20 = 25 hours Let the total capacity of tank = 150 units Efficiency of pipe (A + B) = 150/25 = 6 units/hour Efficiency of pipe ‘C’ = 150/30 = 5 units/hour Tank filled by pipe (A + B) in 23 hours = 23 × 6 = 138 units Time taken by all three pipes to fill the remaining tank = (150 – 138)/(6 – 5) = 12 hrs Total time taken = 23 + 12 = 35 hours
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