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Time taken by pipe ‘A’ and pipe ‘B’, together to fill the tank = 5/0.20 = 25 hours Let the total capacity of tank = 925 units Efficiency of pipe (A + B) = 925/25 = 37 units/hour Efficiency of pipe ‘C’ = 925/37 = 25 units/hour Tank filled by pipe (A + B) in 13 hours = 13 × 37 = 481 units Time taken by all three pipes to fill the remaining tank = (925 – 481)/(37 – 25) = 37 hrs Total time taken = 13 + 37 = 50 hours
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