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Start learning 50% faster. Sign in nowLet the total capacity of tank be 60 units Efficiency of pipe ‘A’ = 60/10 = 6 units/hour Efficiency of pipe ‘B’ = 60/12 = 5 units/hour Tank filled in 2 hours = (6 – 5) = 1 units Therefore, tank filled in (2 × 15 = 30 hours) = 1 × 15 = 15 units Required percentage of tank filled = (15/60) × 100 = 25%
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